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The slot after the article "the" and before the verb "studied" requires a singular noun naming a person. The suffix -ist forms agent nouns for people who practice a field, so "biologist" is the only option that names an individual who carries out research.
The sentence needs a singular noun for something an earthquake produces in a paved surface. "Crack" denotes a narrow fissure, and only it yields the natural phrase "a large crack in the road."
The blank sits between "the" and the noun "documents," a position that only an adjective can occupy. "Original" is the sole adjectival form here and means "first or earliest."
The article "a" marks the noun as singular and countable, and the adjective "long" points to an extended written work. "Novel" is the only singular noun among the options that names a book-length work of fiction.
The blank stands between "the" and the noun "galaxy," so an adjective describing the galaxy is required. "Distant" is the only true adjective in the set.
The auxiliary "was" followed by a blank signals a passive verb phrase, which requires a past participle. "Heated" supplies both the passive form and the meaning that heat was applied to the liquid.
The clause "how ___ changed" needs a noun as its subject, and the context is a mental capacity being measured. "Memory" is the only option naming that faculty.
The noun "air" before the blank forms a compound with a noun for the condition of the air, which planting trees is meant to improve. "Quality" is the only option that supplies that meaning.
The modal "can" must be followed by a bare infinitive, so a verb is required. "Stimulate" is the only base-form verb in the list and it correctly takes "saving" as its object.
The relative clause "that dated back three thousand years" describes physical objects recovered from a site. "Artifacts" is the plural noun for objects made by humans, and its plural form matches the verb "dated."
The blank follows "the" and precedes "of sentences," so a noun naming a structural property of sentences is needed. "Syntax" is the standard term for the arrangement of words into sentences.
The word directly precedes the noun "energy," so it must be an adjective naming a type of energy. "Chemical" is the only adjectival form among the choices.
The compound "ocean ___" requires a plural noun naming large-scale movements of seawater. "Currents" supplies that meaning and fits the plural sense of the influencing forces.
The verb "measured" needs an object naming a physical property, and the singular frame "the ___ of the rock sample" rules out a plural form. "Density" is the singular noun for mass per unit volume.
After "a rare," the sentence requires a singular countable noun naming a work of art. "Sculpture" is the object itself, which is what a museum displays.
The frame "entered a stable ___ around Mars" calls for a singular noun naming a curved path in space. "Orbit" is that noun and is the only option that can be "entered."
The verb "develop" requires a noun object naming the body's resistance to a pathogen, and the preposition "to" follows naturally. "Immunity" is that noun.
The blank must name the natural home of a species, since the sentence links it possessively to "many species." "Habitat" is the standard ecological term for that environment.
The article "a" and the verb "reached" call for a singular noun meaning a settlement in which each side concedes something. "Compromise" supplies exactly that meaning.
The word follows "a constant" and must therefore be a singular noun naming a rate of motion. "Velocity" is the only option that fits both the grammar and the meaning.
The adjective "questionable" modifies a noun for the underlying assumption an argument depends on. "Premise" is the logical term for a proposition from which a conclusion is drawn.
The adverb "statistically" modifies an adjective in this predicate construction, which needs a word describing a result unlikely to arise by chance. "Significant" is that adjective.
The article "a" and the adjective "dominant" require a singular countable noun naming a unit of heredity. "Gene" is that unit, since dominance is a property of a single allele.
The article "a" before the blank requires a singular noun naming a group of people who share a culture. "Society" is the only noun in the set.
The construction "difficult to ___" requires a bare infinitive, and the context is forecasting a storm's strength. "Predict" is the only base-form verb that means to forecast.
The blank requires a noun for the territory a state rules, and "empire" is the standard collocation after "vast." All four options begin with the same letters, so meaning and grammar decide the answer: a possessive such as "their" points to a thing owned or controlled, not a person or an abstract quality.
The compound formed when carbon bonds with two oxygen atoms is carbon dioxide, the gas exhaled by the lungs. Only "dioxide" carries the chemical meaning demanded by "carbon," and its prefix also matches the letters shown.
"Inflation" is the fixed economic term for a sustained rise in the general price level. The other words beginning with the same letters refer to the power to affect something, an arrival of large numbers, or a change in pitch or word ending.
The gradual wearing away of rock by wind and water is erosion, built on the root "erode." The sentence describes slow removal of material, not a sudden discharge, a release of gas or light, or the rubbing out of writing.
The plant organs that draw water from the soil are roots, and the plural form matches the plural possessive "their." The other options are plural nouns as well, so only the meaning of plant anatomy selects the answer.
A diary is a personal day-by-day record, exactly the sort of first-hand document that pairs with letters as a primary source. The sentence needs a written record of daily experience, which none of the other options supplies.
Attention is the cognitive process of focusing on selected information while filtering out competing stimuli. The definition in the sentence names a mental capacity, not presence at an event, the giving of testimony, or a pulling force.
Tempo is the speed at which music is performed, and a conductor's baton is what sets it. The other options name a voice range, a mood, and a state of strain, none of which a baton signals.
Plankton is the collective term for organisms that drift in water and cannot swim against a current. The sentence requires a noun for living things, which rules out a piece of timber, a disease, and an adjective meaning flexible.
Friction is the physical resistance that arises between surfaces in contact. The sentence defines a force, so a numerical part, a type of invented narrative, or an adjective describing weakness cannot complete it.
An antibiotic is a drug that kills bacteria or stops them from multiplying, so it is what a doctor prescribes for a bacterial infection. The other options name immune proteins, a poison neutraliser, and an agent applied to skin or surfaces.
A predator hunts and eats other animals, and "top predator" is the fixed term for a carnivore at the head of a food chain. The blank also needs a plural noun for animals, which the other options are not.
Legislation is the body of laws that a parliament enacts, and "a piece of legislation" is a set phrase. A legislature is the body that makes laws, legitimacy is the quality of being lawful, and a legend is a traditional story or a map key.
The adjective formed from geometry is geometric, the branch of mathematics that deals with shapes and formal proofs. Geological concerns rocks, geographic concerns places, and genetic concerns inheritance.
Pottery is fired clay ware, so a fragment of ancient pottery is a routine excavation find. Poultry means domesticated birds, a potter is the craftsperson who makes the ware, and poverty is a condition of being poor.
"Affordable housing" is the established term for homes that low-income residents can afford, and it refers to homes as a category rather than one building. A house is a single structure, a household is the group of people living together, and a housefly is an insect.
Tutoring is the activity of teaching a learner individually, and it follows the adjective "individual" as the name of the service received. Tuition denotes a fee or general instruction, tutorials are small-group classes, and a tutor is the person who teaches.
Irrigation is the artificial supply of water to land so that crops can grow. The sentence names an agricultural technique, not a feeling of soreness, a lack of regularity, or the repetition of a process.
A tornado is a violently rotating column of air, and a funnel cloud is its visible signature, so a tornado warning is what forecasters issue. A torrent is a fast flow, torment is prolonged suffering, and torn is an adjective meaning ripped.
An agreement is a negotiated arrangement between parties, which is exactly what signing terms on tariffs produces. Aggression is hostile behaviour, an aggregate is a combined total, and agronomy is the science of crop production.
Inadmissible is the precise legal term for evidence that a court will not allow to be presented. It is an adjective describing the status of evidence, whereas one option is an adverb and the others describe quantity or wisdom rather than a rule of law.
The preposition "of" following the blank requires the adjective critical, which means expressing disapproval of something. A criterion is a standard used for judging, a critique is a noun for a detailed review, and the verb criticized cannot take "of" in this construction.
Economic is the adjective meaning relating to the economy, which is the only form that can modify "growth." Economical means thrifty, economics is the name of the academic discipline, and economy is a noun that cannot act as a modifier in this phrase.
Complementary describes two things that complete or enhance each other, which matches the explanation that each treatment supplies what the other lacks. Complimentary means praising or free of charge, comparative means involving comparison, and competence is a noun for ability.
A consensus is a general agreement, and "reach a consensus" is the standard collocation after a period of debate. The other options are adjectives describing awareness, uninterrupted sequence, and diligence, none of which is something a committee can reach.