[DET Science & Nature Vocabulary] 100 Essential Words for DET Speaking & Writing (Score 120+) Free PDF Worksheet
By Sam
Hey everyone, Teacher Sam here! π
Many DET students already know basic science words like animal, nature, or pollution.
But here's the problem.
Knowing a word is not enough.
To score 120 and above on the DET, the AI grading engine evaluates two things:
Lexical Diversity — Are you using a wide range of vocabulary? Lexical Precision — Are you using words in natural, accurate combinations?
This means you need to go beyond basic words and start using them the way native speakers actually do — in collocations.
In this guide, you will find 100 high-frequency Science & Nature words, organized by target score level, each with:
A clear definition
Top collocations
A DET-ready practice sentence
Let's get into it.
π To help you master these concepts, I’ve included a free PDF worksheet at the end of this article. Don't forget to grab your copy and make the most of it in your studies!
π This posting is part of a series.
Science & Nature ✅ You are here!
Arts & Creativityπ
Daily Life & Routines π
Relationships & Community π
Work & Career π
Travel & Culture π
Environment π
Health & Wellness π
Technology π
Education π
π¬ PART 1. Foundation Level (Target: Score 105-115)
These are the core words that form the backbone of any strong DET response on Science & Nature topics.
Focus on using these with zero grammatical errors before moving to higher-level vocabulary.
π Nouns
1. Organism (noun)
Definition: Any living thing — including animals, plants, fungi, and microorganisms — that functions as an independent biological unit.
Top Collocations: living organism, microscopic organism, single-celled organism
DET Practice Sentence: Living organisms depend entirely on the stability of their surrounding environment to survive and reproduce successfully.
2. Habitat (noun)
Definition: The natural environment in which a specific species of animal or plant normally lives and thrives.
Top Collocations: natural habitat, destroy a habitat, marine habitat
DET Practice Sentence: The systematic destruction of natural habitats remains one of the primary drivers of accelerating species extinction.
3. Species (noun)
Definition: A group of living organisms that share common characteristics and are capable of interbreeding to produce fertile offspring.
Top Collocations: endangered species, invasive species, protect a species
DET Practice Sentence: Thousands of animal and plant species are currently at serious risk of extinction due to rapid climate change.
4. Ecosystem (noun)
Definition: A complex biological community of living organisms interacting with each other and their physical environment as a functional system.
Top Collocations: fragile ecosystem, marine ecosystem, ecosystem collapse
DET Practice Sentence: A healthy, balanced ecosystem provides clean air, fresh water, and a reliable food supply for all living things.
5. Atmosphere (noun)
Definition: The layer of gases surrounding a planet, particularly the mixture of gases enveloping Earth that supports life and regulates climate.
Top Collocations: Earth's atmosphere, upper atmosphere, release into the atmosphere
DET Practice Sentence: The Earth's atmosphere acts as a protective shield, filtering harmful solar radiation before it reaches the surface.
6. Gravity (noun)
Definition: The natural force of attraction exerted by a massive body that pulls other objects toward its center.
Top Collocations: force of gravity, gravitational pull, defy gravity
DET Practice Sentence: Gravity is the fundamental force that keeps planets locked in stable orbital paths around the sun.
7. Particle (noun)
Definition: An extremely small unit of matter, such as an atom or molecule, that forms the basic building blocks of all physical substances.
Top Collocations: subatomic particle, dust particle, particle physics
DET Practice Sentence: Scientists have confirmed that light exhibits the dual properties of both a wave and a discrete particle simultaneously.
π‘ Teacher Sam's Quick Note PART 1 words are your safety net. If a Science & Nature prompt appears, these words should come out automatically — no hesitation. Practice writing one sentence per word until they feel completely natural.
π Adjectives
8. Chemical (adjective)
Definition: Relating to chemistry, or involving the properties and interactions of substances at the molecular and atomic level.
Top Collocations: chemical reaction, chemical compound, chemical process
DET Practice Sentence: The complex chemical reactions occurring within the human digestive system convert raw nutrients into usable energy.
9. Biological (adjective)
Definition: Relating to biology or the study of living organisms and their vital processes.
Top Collocations: biological diversity, biological process, biological clock
DET Practice Sentence: Biological diversity is considered essential for maintaining the long-term stability and resilience of natural ecosystems.
10. Renewable (adjective)
Definition: Relating to natural resources or energy sources that can be naturally replenished within a human timescale.
Top Collocations: renewable energy, renewable resource, shift to renewable
DET Practice Sentence: Renewable energy sources such as solar and wind power are rapidly becoming more cost-competitive than fossil fuels.
11. Toxic (adjective)
Definition: Containing poisonous substances capable of causing serious damage, illness, or death to living organisms.
Top Collocations: toxic waste, toxic chemical, toxic environment
DET Practice Sentence: Toxic chemicals illegally discharged into river systems can devastate entire aquatic ecosystems within weeks.
12. Marine (adjective)
Definition: Relating to the ocean, sea, or the plant and animal life found within saltwater environments.
Top Collocations: marine life, marine biology, marine ecosystem
DET Practice Sentence: Marine ecosystems worldwide are under unprecedented threat from the accelerating accumulation of plastic pollution.
π Verbs
13. Observe (verb)
Definition: To watch, study, or monitor something carefully and systematically, especially for scientific purposes.
Top Collocations: closely observe, observe behavior, observe patterns
DET Practice Sentence: Field biologists closely observe animal behavior in undisturbed natural habitats to accurately map seasonal migration routes.
14. Evolve (verb)
Definition: To develop gradually over many generations through the process of natural selection, resulting in heritable changes within a population.
Top Collocations: evolve over time, evolve in response to, rapidly evolve
DET Practice Sentence: Species evolve gradually over thousands of generations in direct response to sustained environmental pressures.
15. Extract (verb)
Definition: To remove or obtain a substance from a larger source through a deliberate physical or chemical process.
Top Collocations: extract DNA, extract resources, extract samples
DET Practice Sentence: Paleontologists carefully extract DNA samples from fossilized remains in order to reconstruct the biology of prehistoric life.
16. Reproduce (verb)
Definition: To produce offspring through biological processes, either sexually or asexually, to ensure the continuation of a species.
Top Collocations: reproduce rapidly, reproduce asexually, reproduce in captivity
DET Practice Sentence: Certain plant species can reproduce entirely without seeds through a biological mechanism known as vegetative propagation.
17. Emit (verb)
Definition: To produce and discharge energy, light, heat, gas, or radiation from a source into the surrounding environment.
Top Collocations: emit greenhouse gases, emit radiation, emit carbon dioxide
DET Practice Sentence: Heavy industrial facilities emit massive quantities of greenhouse gases into the atmosphere on a daily basis.
18. Adapt (verb)
Definition: To adjust or modify biological traits, behaviors, or physical structures in response to changes in environmental conditions.
Top Collocations: adapt to change, adapt over time, adapt to survive
DET Practice Sentence: Animal species that are unable to rapidly adapt to shifting climate conditions face a significantly elevated risk of extinction.
19. Decompose (verb)
Definition: To break down organic matter into simpler chemical components through the action of bacteria, fungi, or other biological agents.
Top Collocations: decompose naturally, decompose rapidly, decompose into nutrients
DET Practice Sentence: Fallen leaves decompose on the forest floor over time, returning vital nutrients directly back into the soil.
20. Circulate (verb)
Definition: To move continuously through a closed system or network, distributing substances, energy, or information throughout.
Top Collocations: circulate freely, circulate through the body, circulate warm air
DET Practice Sentence: Deep ocean currents circulate vast quantities of warm and cold water around the globe, playing a critical role in climate regulation.
❌ Common DET Mistake #1 Many students write: "Animals adapt over millions of years." ✅ Correct: "Species evolve over millions of years." Adapt = short-term behavioral change. Evolve = long-term genetic change across generations.
π PART 2. High-Scoring Essentials (Target: Score 115-120)
These words separate a good response from a great one.
Integrating these naturally into your Writing Sample and Speaking Sample demonstrates a sophisticated command of scientific language.
π€ DET Speaking Prompt Practice "Should governments prioritize funding for scientific research over other social programs such as education or healthcare?" Try answering using at least 5 words from PART 2 before reading on.
π Nouns
21. Phenomenon (noun)
Definition: A fact or occurrence observed in the natural world, especially one whose cause or explanation is under active investigation.
Top Collocations: natural phenomenon, global phenomenon, widespread phenomenon
DET Practice Sentence: Climate change has evolved from a regional environmental concern into a truly global phenomenon affecting every inhabited continent.
22. Hypothesis (noun)
Definition: A proposed explanation for an observed fact, formulated as a starting point for further scientific investigation.
Top Collocations: test a hypothesis, form a hypothesis, support a hypothesis
DET Practice Sentence: Before designing a controlled experiment, scientists must formulate a clear and testable hypothesis to guide their research.
23. Biodiversity (noun)
Definition: The variety of plant and animal life found within a particular habitat or ecosystem, considered an indicator of ecological health.
Top Collocations: protect biodiversity, biodiversity loss, rich biodiversity
DET Practice Sentence: Actively protecting biodiversity is considered essential for preserving the long-term stability and resilience of natural ecosystems.
π‘ Why biodiversity matters in DET This word appears in climate prompts, conservation debates, and technology vs environment questions. If you can use it naturally, you instantly signal a higher vocabulary level to the AI grader.
24. Fossil (noun)
Definition: The preserved remains or impression of a prehistoric organism embedded in rock or sediment over millions of years.
Top Collocations: fossil record, fossil fuels, ancient fossil
DET Practice Sentence: Fossils embedded in ancient rock formations provide paleontologists with invaluable physical evidence about organisms that lived millions of years ago.
25. Sediment (noun)
Definition: Matter that settles to the bottom of a liquid, or material deposited by water, wind, or glaciers on land surfaces over time.
Top Collocations: river sediment, sediment layers, deposit sediment
DET Practice Sentence: River sediment carries a rich supply of nutrients downstream, naturally enriching the agricultural soil of surrounding floodplains.
26. Radiation (noun)
Definition: The emission and propagation of energy through space in the form of waves or particles, including heat, light, and nuclear energy.
Top Collocations: ultraviolet radiation, solar radiation, exposure to radiation
DET Practice Sentence: Prolonged and unprotected exposure to ultraviolet radiation significantly elevates an individual's lifetime risk of developing skin cancer.
27. Mutation (noun)
Definition: A permanent alteration in the DNA sequence of an organism's genome that may be inherited and can affect physical traits.
Top Collocations: genetic mutation, random mutation, beneficial mutation
DET Practice Sentence: Genetic mutations can be harmful, entirely neutral, or in rare cases, genuinely beneficial to the long-term survival of an organism.
28. Predator (noun)
Definition: An organism that hunts, kills, and feeds on other organisms as its primary source of nutrition within a food chain.
Top Collocations: apex predator, natural predator, predator-prey relationship
DET Practice Sentence: The removal of apex predators from a balanced ecosystem can trigger severe and cascading imbalances throughout the entire food chain.
29. Pollutant (noun)
Definition: A harmful substance introduced into the natural environment as a result of human industrial, agricultural, or domestic activity.
Top Collocations: industrial pollutant, airborne pollutant, release pollutants
DET Practice Sentence: Industrial pollutants discharged directly into freshwater rivers can completely devastate local aquatic ecosystems within a short period.
30. Nucleus (noun)
Definition: The dense, membrane-bound organelle at the center of a eukaryotic cell, containing the cell's genetic material and controlling its activities.
Top Collocations: cell nucleus, atomic nucleus, nucleus of a cell
DET Practice Sentence: The nucleus of every living cell contains the complete genetic blueprint that governs all of the cell's biological functions.
31. Compound (noun)
Definition: A substance formed when two or more chemical elements are chemically bonded together in fixed proportions.
Top Collocations: chemical compound, organic compound, form a compound
DET Practice Sentence: Water is a deceptively simple chemical compound, consisting of precisely two hydrogen atoms bonded to a single oxygen atom.
32. Eruption (noun)
Definition: The sudden, violent expulsion of lava, ash, gas, and pyroclastic material from a volcano or similar geological structure.
Top Collocations: volcanic eruption, sudden eruption, eruption of a geyser
DET Practice Sentence: The catastrophic volcanic eruption released enormous volumes of ash and toxic gas directly into the upper atmosphere.
33. Trajectory (noun)
Definition: The curved path followed by a projectile, missile, or celestial body moving under the influence of given forces.
Top Collocations: orbital trajectory, flight trajectory, calculate a trajectory
DET Practice Sentence: Mission scientists meticulously calculate the precise orbital trajectory of spacecraft well before any launch attempt is authorized.
34. Symbiosis (noun)
Definition: A close and long-term biological interaction between two different species, which may be mutually beneficial, neutral, or harmful to one partner.
Top Collocations: mutual symbiosis, symbiosis between species, biological symbiosis
DET Practice Sentence: The pollination relationship between flowering plants and bees represents one of the most well-documented examples of mutual symbiosis in nature.
35. Photosynthesis (noun)
Definition: The biological process by which green plants convert sunlight, water, and carbon dioxide into glucose and oxygen.
Top Collocations: process of photosynthesis, rate of photosynthesis, undergo photosynthesis
DET Practice Sentence: Through the process of photosynthesis, plants convert absorbed sunlight into chemical energy stored within glucose molecules.
π Adjectives
36. Aquatic (adjective)
Definition: Living, growing, or taking place in, on, or near water, especially in freshwater or marine environments.
Top Collocations: aquatic life, aquatic ecosystem, aquatic environment
DET Practice Sentence: Aquatic plants perform a critical ecological function by maintaining adequate oxygen levels in rivers, lakes, and wetlands.
37. Microscopic (adjective)
Definition: So extremely small as to be visible only with the aid of a microscope.
Top Collocations: microscopic organism, microscopic level, microscopic examination
DET Practice Sentence: Microscopic soil organisms play an indispensable role in breaking down dead organic matter and continuously recycling essential nutrients.
38. Terrestrial (adjective)
Definition: Relating to or living on the land surface of the Earth, as opposed to aquatic or aerial environments.
Top Collocations: terrestrial ecosystem, terrestrial species, terrestrial habitat
DET Practice Sentence: Terrestrial ecosystems such as tropical rainforests and temperate grasslands collectively support the vast majority of the world's known biodiversity.
39. Dormant (adjective)
Definition: In a state of temporary biological inactivity during which normal metabolic processes are significantly reduced.
Top Collocations: dormant volcano, lie dormant, dormant seed
DET Practice Sentence: Numerous volcanoes worldwide remain geologically dormant for centuries before erupting violently and without warning.
40. Sustainable (adjective)
Definition: Capable of being maintained at a consistent level without depleting natural resources or causing irreversible ecological damage.
Top Collocations: sustainable development, sustainable energy, sustainable farming
DET Practice Sentence: Developing truly sustainable agricultural practices is considered essential for feeding a rapidly expanding global population.
41. Indigenous (adjective)
Definition: Originating or occurring naturally in a particular region or ecosystem; native to a specific geographic area.
Top Collocations: indigenous species, indigenous plant, indigenous population
DET Practice Sentence: Indigenous plant species are typically far better adapted to local soil composition and prevailing climate conditions than introduced varieties.
42. Atmospheric (adjective)
Definition: Relating to or existing within the atmosphere surrounding a planet, particularly Earth's gaseous envelope.
Top Collocations: atmospheric pressure, atmospheric carbon dioxide, atmospheric conditions
DET Practice Sentence: The continuous rise in atmospheric carbon dioxide concentrations is now directly and measurably linked to accelerating global temperature increases.
43. Genetic (adjective)
Definition: Relating to genes, heredity, or the branch of biology concerned with the transmission of inherited characteristics.
Top Collocations: genetic material, genetic diversity, genetic research
DET Practice Sentence: Advances in genetic research have fundamentally transformed scientific understanding of inherited diseases and the biological basis of health.
44. Nocturnal (adjective)
Definition: Relating to or active during the night rather than during daylight hours.
Top Collocations: nocturnal animal, nocturnal behavior, nocturnal predator
DET Practice Sentence: Nocturnal mammals such as bats and owls have developed highly specialized sensory adaptations to hunt effectively in complete darkness.
45. Invasive (adjective)
Definition: Describing a non-native species introduced to a new environment that spreads aggressively, often causing significant ecological damage.
Top Collocations: invasive species, invasive plant, invasive organism
DET Practice Sentence: Invasive species deliberately or accidentally introduced by human activity have devastated native wildlife populations across numerous regions worldwide.
46. Fossil-fuel-based (adjective)
Definition: Dependent on or derived from coal, oil, or natural gas — non-renewable carbon-based energy sources.
Top Collocations: fossil-fuel-based economy, fossil-fuel-based energy, transition away from fossil-fuel-based
DET Practice Sentence: Transitioning away from fossil-fuel-based energy infrastructure is now considered critical to meaningfully reducing global carbon emissions.
47. Arid (adjective)
Definition: Having little or no rainfall; extremely dry, with insufficient moisture to support most forms of vegetation.
Top Collocations: arid climate, arid region, arid landscape
DET Practice Sentence: Plant species native to arid desert regions have evolved remarkable physiological mechanisms to store water efficiently in their leaves and stems.
48. Volatile (adjective)
Definition: Liable to change rapidly and unpredictably; in a scientific context, easily evaporated at normal temperatures.
Top Collocations: volatile conditions, volatile climate, highly volatile
DET Practice Sentence: Increasingly volatile weather patterns are making it significantly more difficult for meteorologists to predict the timing and severity of natural disasters.
❌ Common DET Mistake #2 ❌ The weather has been very volatile this year, so scientists are worried. ✅ Better: Increasingly volatile weather patterns are making accurate climate prediction significantly more challenging. In DET Writing, avoid starting sentences with "The weather" — it sounds too conversational. Use "weather patterns" or "climatic conditions" instead.
π Verbs
49. Synthesize (verb)
Definition: To combine separate elements or substances to form a new compound through a chemical or biological process.
Top Collocations: synthesize compounds, synthesize glucose, artificially synthesize
DET Practice Sentence: During photosynthesis, green plants synthesize glucose molecules by combining absorbed sunlight, atmospheric carbon dioxide, and ground water.
50. Contaminate (verb)
Definition: To make a substance, environment, or organism impure or unsafe through the introduction of harmful pollutants.
Top Collocations: contaminate water, contaminate soil, contaminate food supply
DET Practice Sentence: Industrial waste improperly discharged into the environment can contaminate groundwater sources and pose serious long-term risks to public health.
51. Regulate (verb)
Definition: To control or maintain a system, process, or biological function within defined, stable parameters.
Top Collocations: regulate temperature, regulate the body, regulate emissions
DET Practice Sentence: The human body maintains multiple sophisticated internal systems that work in concert to precisely regulate core body temperature.
52. Accelerate (verb)
Definition: To increase the speed or rate at which a process, change, or phenomenon occurs.
Top Collocations: accelerate climate change, accelerate growth, accelerate decay
DET Practice Sentence: Unchecked human industrial activity has significantly accelerated the underlying rate of global climate change over the past century.
53. Harness (verb)
Definition: To capture, control, and utilize a natural force or energy source for productive human purposes.
Top Collocations: harness solar energy, harness wind power, harness natural resources
DET Practice Sentence: Scientists and engineers are continuously developing more efficient and affordable technologies to harness solar energy on a large scale.
54. Migrate (verb)
Definition: To move from one region or habitat to another on a seasonal or permanent basis, typically in response to environmental changes.
Top Collocations: migrate seasonally, migrate south, migrate in search of
DET Practice Sentence: Many migratory bird species travel thousands of kilometers each year in search of warmer climates and more abundant food supplies.
55. Deteriorate (verb)
Definition: To become progressively worse in quality, condition, or function over a period of time.
Top Collocations: deteriorate rapidly, deteriorate over time, air quality deteriorates
DET Practice Sentence: Urban air quality continues to deteriorate steadily in major cities as vehicle exhaust emissions increase year after year.
56. Trigger (verb)
Definition: To cause or initiate a particular reaction, event, or process, often suddenly or unexpectedly.
Top Collocations: trigger a response, trigger hibernation, trigger an eruption
DET Practice Sentence: A sudden and sustained drop in ambient temperature can trigger the onset of hibernation in certain mammal species.
57. Absorb (verb)
Definition: To take in or soak up energy, liquid, or another substance through chemical or physical processes.
Top Collocations: absorb carbon dioxide, absorb sunlight, absorb nutrients
DET Practice Sentence: Old-growth forests absorb enormous quantities of atmospheric carbon dioxide, playing a vital role in slowing the pace of global warming.
58. Sustain (verb)
Definition: To support, maintain, or prolong the existence or vitality of a system, organism, or process over time.
Top Collocations: sustain life, sustain productivity, sustain an ecosystem
DET Practice Sentence: Maintaining healthy and nutrient-rich soil is absolutely essential to sustaining long-term agricultural productivity.
59. Interact (verb)
Definition: To act in a way that has a direct effect on another organism, substance, or system within a shared environment.
Top Collocations: interact with the environment, interact within an ecosystem, interact chemically
DET Practice Sentence: Different species interact with one another in highly complex and interdependent ways that collectively maintain overall ecological balance.
60. Fluctuate (verb)
Definition: To rise and fall irregularly in number, amount, or intensity over a period of time.
Top Collocations: fluctuate dramatically, fluctuate seasonally, temperatures fluctuate
DET Practice Sentence: Ocean surface temperatures fluctuate significantly throughout the year in direct response to seasonal atmospheric and oceanic circulation changes.
61. Filter (verb)
Definition: To pass a substance through a medium that removes unwanted particles, impurities, or contaminants.
Top Collocations: filter pollutants, filter water naturally, filter through
DET Practice Sentence: Wetland ecosystems perform an invaluable ecological service by naturally filtering waterborne pollutants before they reach downstream rivers and lakes.
62. Disrupt (verb)
Definition: To interrupt or interfere with the normal functioning of a system, process, or established pattern.
Top Collocations: disrupt an ecosystem, disrupt the food chain, disrupt migration
DET Practice Sentence: Aggressively spreading invasive species can fundamentally disrupt local ecosystems by outcompeting native plants and animals for limited resources.
63. Erode (verb)
Definition: To gradually wear away or destroy a surface or structure through the prolonged action of natural forces such as water or wind.
Top Collocations: erode coastlines, erode topsoil, erode over time
DET Practice Sentence: Sustained heavy rainfall can rapidly erode the uppermost layer of productive topsoil, permanently reducing the land's capacity to support vegetation.
64. Replenish (verb)
Definition: To restore or refill a supply of something that has been depleted or used up.
Top Collocations: replenish water reserves, replenish nutrients, replenish stocks
DET Practice Sentence: Seasonal monsoon rains naturally replenish underground aquifers and freshwater reserves that entire communities depend upon year-round.
65. Disperse (verb)
Definition: To spread or scatter widely across a large area, often as a mechanism for colonizing new territories.
Top Collocations: disperse seeds, disperse pollutants, disperse across regions
DET Practice Sentence: Wind currents and animal movement both play critical roles in dispersing plant seeds across wide geographic areas, supporting overall botanical diversity.
66. Regenerate (verb)
Definition: To regrow, renew, or restore a biological structure, ecosystem, or population to its previous healthy state.
Top Collocations: regenerate tissue, regenerate a forest, regenerate coral reefs
DET Practice Sentence: Given adequate time and effective legal protection, severely damaged coral reef systems can slowly but measurably regenerate and recover their lost biodiversity.
67. Thrive (verb)
Definition: To grow vigorously, flourish, and prosper in a given environment or set of conditions.
Top Collocations: thrive in harsh conditions, thrive in the wild, thrive under pressure
DET Practice Sentence: Certain highly specialized plant species thrive in nutrient-depleted soils where the vast majority of other plant life simply cannot survive.
68. Deplete (verb)
Definition: To use up or reduce a resource, supply, or population to a critically low level.
Top Collocations: deplete natural resources, deplete fish stocks, deplete the ozone layer
DET Practice Sentence: Decades of unchecked overfishing have severely depleted commercial fish populations across many of the world's most productive ocean regions.
69. Photosynthesize (verb)
Definition: To carry out the biological process of photosynthesis, converting light energy into chemical energy stored as organic compounds.
Top Collocations: photosynthesize efficiently, photosynthesize using sunlight, ability to photosynthesize
DET Practice Sentence: Submerged aquatic plants photosynthesize using filtered sunlight that manages to penetrate the surface layers of freshwater lakes and slow-moving rivers.
70. Mitigate (verb)
Definition: To make a harmful situation or negative effect less severe through deliberate action.
Top Collocations: mitigate climate change, mitigate risks, mitigate the effects of
DET Practice Sentence: Large-scale reforestation initiatives have demonstrated measurable potential to mitigate the long-term consequences of unchecked carbon emissions.
❌ Common DET Mistake #3 ❌ We need to mitigate pollution by not using cars. ✅ Better: Governments must implement comprehensive emission reduction policies to effectively mitigate the long-term consequences of industrial pollution. Mitigate sounds strongest when paired with a formal subject (governments, policies, strategies) — not personal actions.
⭐ PART 3. Expert & Sophisticated (Target: Score 120-135+)
This is where your score separates from the crowd.
Deploying even one or two of these advanced terms naturally within your responses signals maximum Lexical Precision to the AI evaluator.
You do not need to use all of them. Use one well. That is enough.
π€ DET Speaking Prompt Practice "Is human activity the primary driver of climate change, or are natural factors equally responsible?" Before reading PART 3, write a 60-second spoken response. Then come back and see which words you could have used.
π Advanced Nouns
71. Equilibrium (noun)
Definition: A state of dynamic balance between opposing forces or populations within a biological or physical system.
Top Collocations: biological equilibrium, ecological equilibrium, disturb the equilibrium
DET Practice Sentence: The removal of even a single keystone species from a complex ecosystem can fundamentally destabilize its entire biological equilibrium.
72. Proliferation (noun)
Definition: The rapid and often uncontrolled multiplication or spread of organisms, cells, or substances within a system.
Top Collocations: unchecked proliferation, rapid proliferation, cell proliferation
DET Practice Sentence: The unchecked proliferation of invasive algae in shallow coastal waters can suffocate native marine life and collapse local fisheries.
73. Taxonomy (noun)
Definition: The systematic science of classifying living organisms into hierarchical groups based on shared characteristics and evolutionary relationships.
Top Collocations: biological taxonomy, taxonomy of species, taxonomic classification
DET Practice Sentence: Taxonomy provides scientists with a universal, standardized framework for classifying and formally naming every known living organism on Earth.
74. Entropy (noun)
Definition: A thermodynamic quantity representing the degree of disorder or energy dispersal within a closed physical system.
Top Collocations: increase in entropy, thermodynamic entropy, entropy of a system
DET Practice Sentence: In thermodynamics, entropy describes the inherent tendency of all closed systems to move progressively toward states of greater disorder.
75. Speciation (noun)
Definition: The evolutionary process through which new and distinct biological species arise from a common ancestral population over time.
Top Collocations: geographic speciation, rapid speciation, process of speciation
DET Practice Sentence: Geographic isolation of populations over extended geological timescales is considered one of the primary mechanisms driving biological speciation.
76. Thermodynamics (noun)
Definition: The branch of physical science concerned with the relationships between heat, work, temperature, and energy in physical systems.
Top Collocations: laws of thermodynamics, field of thermodynamics, principles of thermodynamics
DET Practice Sentence: The fundamental laws of thermodynamics govern the transfer and transformation of energy within all known physical and chemical systems.
77. Lithosphere (noun)
Definition: The rigid outermost layer of the Earth, consisting of the crust and the uppermost portion of the mantle, divided into tectonic plates.
Top Collocations: Earth's lithosphere, lithospheric plates, movement of the lithosphere
DET Practice Sentence: The lithosphere, comprising Earth's crust and upper mantle, is fractured into numerous massive tectonic plates that drift continuously over geological time.
78. Gestation (noun)
Definition: The period of development from conception to birth during which an embryo develops within the uterus of a mammal.
Top Collocations: gestation period, prolonged gestation, gestation of an idea
DET Practice Sentence: The gestation period of the African elephant extends to nearly two full years, making it the longest known gestation among all land mammals.
79. Permeability (noun)
Definition: The property of a material or membrane that allows fluids, gases, or other substances to pass through it under pressure.
Top Collocations: soil permeability, membrane permeability, high permeability
DET Practice Sentence: The permeability of agricultural soil directly determines how efficiently rainwater is absorbed and how effectively it supports root development.
80. Photovoltaic (noun/adjective)
Definition: Relating to the direct conversion of light energy, particularly sunlight, into electrical energy through semiconductor materials.
Top Collocations: photovoltaic panel, photovoltaic cell, photovoltaic technology
DET Practice Sentence: Photovoltaic panels generate clean electricity by converting incident sunlight directly into usable electrical current through the photoelectric effect.
81. Nuance (noun)
Definition: A very subtle or precise distinction in meaning, especially within a complex or sensitive subject.
Top Collocations: subtle nuance, nuance of meaning, appreciate the nuance
DET Practice Sentence: Understanding the full nuances of climate science requires careful analysis of long-term data rather than reliance on short-term weather patterns.
π Advanced Adjectives
82. Symbiotic (adjective)
Definition: Relating to or characterized by a close, long-term biological relationship between two different species.
Top Collocations: symbiotic relationship, symbiotic organisms, mutually symbiotic
DET Practice Sentence: The deeply symbiotic relationship between mycorrhizal fungi and tree root systems significantly enhances the host tree's capacity to absorb soil nutrients.
83. Tectonic (adjective)
Definition: Relating to the large-scale structural deformation of the Earth's crust and the forces responsible for it.
Top Collocations: tectonic plates, tectonic activity, tectonic shift
DET Practice Sentence: Intense tectonic activity concentrated along major geological fault lines is directly responsible for the majority of the world's most destructive earthquakes.
84. Catalytic (adjective)
Definition: Relating to or acting as a catalyst; capable of initiating or dramatically accelerating a chemical reaction without being consumed.
Top Collocations: catalytic reaction, catalytic converter, catalytic role
DET Practice Sentence: Enzymes perform an essential catalytic function within biological systems by dramatically accelerating the rate of critical biochemical reactions.
85. Glacial (adjective)
Definition: Relating to or produced by glaciers or ice sheets; moving at an extremely slow pace.
Top Collocations: glacial retreat, glacial period, glacial pace
DET Practice Sentence: The accelerating rate of glacial retreat observed in polar regions over recent decades is widely attributed to sustained increases in global surface temperatures.
86. Osmotic (adjective)
Definition: Relating to osmosis, the process by which water moves across a semipermeable membrane from an area of lower to higher solute concentration.
Top Collocations: osmotic pressure, osmotic balance, osmotic stress
DET Practice Sentence: Osmotic pressure plays a critical physiological role in regulating the controlled movement of water molecules across living cell membranes.
87. Biogeochemical (adjective)
Definition: Relating to the chemical, physical, geological, and biological processes governing the cycling of elements in natural systems.
Top Collocations: biogeochemical cycle, biogeochemical process, global biogeochemical
DET Practice Sentence: Biogeochemical cycles such as the global carbon and nitrogen cycles are fundamentally important to the sustained functioning of life on Earth.
88. Metamorphic (adjective)
Definition: Relating to rock that has been altered by heat, pressure, or chemically active fluids at depth within the Earth's crust.
Top Collocations: metamorphic rock, metamorphic process, metamorphic transformation
DET Practice Sentence: Metamorphic rocks are formed when pre-existing rock types are subjected to extreme heat and pressure deep beneath the Earth's surface.
π Advanced Verbs
89. Sequester (verb)
Definition: To isolate, remove, or store a substance — particularly carbon dioxide — from circulation within the atmosphere or a biological system.
Top Collocations: sequester carbon, sequester greenhouse gases, sequester nutrients
DET Practice Sentence: Mature forest ecosystems sequester vast quantities of atmospheric carbon dioxide, performing an indispensable role in moderating global climate.
90. Coevolve (verb)
Definition: To undergo simultaneous evolutionary change in two or more species as a direct result of their close ecological relationship.
Top Collocations: coevolve with predators, coevolve over millennia, coevolve in response to
DET Practice Sentence: Predator and prey species frequently coevolve in parallel over geological time, each developing increasingly sophisticated adaptations in direct response to the other.
91. Bioaccumulate (verb)
Definition: To gradually accumulate a toxic chemical within the tissues of a living organism faster than it can be metabolized or excreted.
Top Collocations: bioaccumulate in tissues, bioaccumulate through the food chain, toxic substances bioaccumulate
DET Practice Sentence: Persistent toxic substances such as methylmercury tend to bioaccumulate progressively within the fatty tissues of fish and other marine organisms.
92. Stratify (verb)
Definition: To form or arrange into distinct horizontal layers based on differences in physical or chemical properties.
Top Collocations: stratify into layers, thermally stratify, stratify by density
DET Practice Sentence: Ocean water stratifies naturally into clearly defined thermal layers based on measurable differences in temperature and salinity with increasing depth.
93. Catalyze (verb)
Definition: To act as a catalyst for a chemical or biological reaction, dramatically increasing its rate without being consumed.
Top Collocations: catalyze a reaction, catalyze change, catalyze decomposition
DET Practice Sentence: Specific biological enzymes catalyze complex biochemical reactions that would otherwise require thousands of years to complete under natural conditions.
94. Leach (verb)
Definition: To drain away from soil as a result of percolating water, often carrying dissolved minerals or chemicals with it.
Top Collocations: leach into groundwater, leach nutrients, leach toxic chemicals
DET Practice Sentence: Agricultural pesticides can leach through layers of soil into underground water tables, posing serious and long-lasting risks to public health.
95. Propagate (verb)
Definition: To spread, reproduce, or transmit something — such as a wave, organism, or idea — through a medium or across a population.
Top Collocations: propagate sound waves, propagate through a medium, propagate a species
DET Practice Sentence: Sound waves propagate through different physical mediums at substantially varying speeds determined primarily by the medium's molecular density.
96. Attenuate (verb)
Definition: To reduce the strength, intensity, or effect of something, particularly a signal, force, or biological agent.
Top Collocations: attenuate a signal, attenuate the impact, attenuate sound
DET Practice Sentence: Dense layers of mature vegetation help significantly attenuate the destructive surface impact of heavy rainfall on exposed topsoil.
97. Desalinate (verb)
Definition: To remove dissolved salts and minerals from seawater to produce freshwater suitable for human consumption or irrigation.
Top Collocations: desalinate seawater, desalinate at scale, desalinate using solar energy
DET Practice Sentence: Water-scarce coastal regions increasingly rely on energy-intensive industrial facilities to desalinate seawater and meet their growing freshwater demands.
98. Fossilize (verb)
Definition: To become preserved as a fossil through the gradual replacement of organic material with mineral substances over geological time.
Top Collocations: fossilize over time, rarely fossilize, fossilize in sediment
DET Practice Sentence: Soft-bodied marine organisms rarely fossilize successfully because their tissues decompose too rapidly after death to be preserved in sedimentary rock.
99. Metamorphose (verb)
Definition: To undergo a dramatic and fundamental change in physical form or structure through a biological or transformative process.
Top Collocations: metamorphose into, metamorphose completely, metamorphose over time
DET Practice Sentence: Caterpillars undergo a remarkable biological metamorphosis, transforming into fully formed adult butterflies within the protective casing of a chrysalis.
100. Desiccate (verb)
Definition: To remove all moisture from a substance or environment, causing it to become completely dry and biologically inactive.
Top Collocations: desiccate soil, desiccate vegetation, desiccate rapidly
DET Practice Sentence: Prolonged and extreme heat waves can rapidly desiccate exposed soil and ground cover vegetation, dramatically accelerating regional desertification.
❌ Common DET Mistake #4 ❌ The sun desiccated the ground and made it very dry. ✅ Better: Prolonged drought conditions can desiccate topsoil entirely, triggering irreversible desertification across vulnerable regions. Never explain a word after using it (very dry). If you use desiccate correctly, the meaning is already embedded.
π Confusing Word Showdown (Nuance Matters)
To secure a maximum score, you must avoid using near-synonyms interchangeably when their precise scientific contexts differ.
① Emit vs. Release
Emit: Used specifically when energy, light, heat, or gases are discharged outward from a physical or biological source as a natural byproduct of a process.
Industrial factories continuously emit harmful greenhouse gases as a direct byproduct of large-scale combustion.
Release: A broader term used when any substance or entity is deliberately or accidentally set free from containment.
The chemical plant was cited for illegally releasing untreated toxic effluent directly into the local river system.
② Sustainable vs. Renewable
Sustainable: Describes a broad approach or system that can be maintained indefinitely without depleting resources or causing lasting ecological harm.
The city adopted a comprehensive sustainable urban development plan to reduce its long-term environmental footprint.
Renewable: Refers specifically to energy sources or natural resources that are naturally replenished within a human timescale.
Solar and wind power are classified as renewable energy sources because they are continuously replenished by natural processes.
③ Adapt vs. Evolve
Adapt: Describes behavioral or physiological adjustments made by an individual organism in direct response to immediate environmental conditions — occurring within a single lifetime or generation.
The migratory birds adapted their departure timing in response to unusually warm autumn temperatures.
Evolve: Describes the gradual, heritable genetic changes that occur across multiple generations through the mechanism of natural selection — operating over long timescales.
Over millions of years, whales evolved from land-dwelling mammals into fully aquatic marine organisms.
𧩠Mini Quiz Which sentence is more natural for DET?
A) Solar panels use renewable energy to make electricity. B) Photovoltaic technology harnesses renewable solar energy to generate clean electricity at scale.
Answer: B — it uses precise collocations (harness, generate, at scale) that signal Lexical Sophistication to the AI grader.
π― DET Master Structures (Plug-and-Play Production Templates)
𧩠Structure A: Environmental Impact
"The accelerating degradation of natural ecosystems — driven primarily by industrial pollution, habitat destruction, and climate change — poses an existential threat to the biological equilibrium that sustains all life on Earth."
When to use: Deploy this as a powerful opening or closing sentence for any prompt addressing environmental protection, conservation policy, or the relationship between human activity and ecological health.
𧩠Structure B: Scientific Progress
"While technological innovation has dramatically accelerated our capacity to harness natural resources, it has simultaneously imposed an obligation to develop sustainable systems that preserve biodiversity and mitigate the long-term consequences of ecological disruption."
When to use: Use this structure when responding to prompts that explore the tension between scientific advancement and environmental responsibility.
π‘ "Looking to master these 100 essential words and collocations?"
To help you study effectively anytime, anywhere, I’ve prepared a comprehensive [DET Science & Nature 100 Essential Vocabulary PDF]. Download it through the link below and start building your own personalized word bank! π
π Download Your Learning Materials Here (bit.ly/4wBUCqh)Teacher Sam's Final Note: Select exactly 5 new words from this master list right now. Write a single, cohesive paragraph describing how human activity has affected a specific natural environment you are familiar with. Active production is the only reliable path to true vocabulary ownership!
© 2026 DETnT (DETntedu.com). All rights reserved. > Written by Sam. Total or partial reproduction of this content without clear attribution is strictly prohibited and subject to Google DMCA takedown.
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