Meaning: 'To learn' means to acquire knowledge or skills through experience or education, emphasizing the goal of science in understanding systems.

Wrong options:

• learn: The word 'learn' is in the present tense and does not fit the infinitive structure required after 'allowing humans.'
• learned: 'Learned' is the past tense form and does not fit the context of an ongoing process of acquiring knowledge.
• learning: 'Learning' is a gerund and does not fit the grammatical structure needed after 'allowing humans.'

Correct answer: traditional

Explanation: The word 'traditional' fits contextually as it describes theories that have been long established and are often accepted, aligning with the idea of theories being proven incorrect. It also matches grammatically as an adjective modifying 'theories.'

Meaning: 'Traditional' refers to ideas or practices that have been handed down through generations, indicating established human theories about the environment.

Wrong options:

• acceptable: 'Acceptable' implies a standard of approval, which does not accurately describe theories that have been proven incorrect.
• obscure: 'Obscure' means not well-known or unclear, which does not fit the context of theories that are widely recognized and proven wrong.
• verified: 'Verified' suggests that theories have been confirmed, which contradicts the statement that they have been proven incorrect.

Correct answer: key

Explanation: The word 'key' serves as an adjective that emphasizes the importance of the aspect being discussed. It fits grammatically and contextually, highlighting the essential nature of measurement in science.

Meaning: 'Key' means crucial or essential, indicating that measuring and comparing variables is a fundamental part of scientific inquiry.

Wrong options:

• banal: 'Banal' means lacking originality, which does not convey the significance of the aspect being discussed.
• radical: 'Radical' implies a fundamental change or departure from the norm, which does not accurately describe the essential nature of measurement in science.
• visionary: 'Visionary' suggests imaginative or forward-thinking, which does not fit the context of a fundamental aspect of science.

Correct answer: drawn

Explanation: The word 'drawn' fits grammatically as the past participle form used in passive voice, indicating that conclusions are derived from observations. It aligns contextually with the idea of conclusions being based on human observation.

Meaning: 'Drawn' means to derive or conclude something from evidence or reasoning, emphasizing the process of reaching conclusions in science.

Wrong options:

• captured: 'Captured' implies taking something physically, which does not fit the context of deriving conclusions from observations.
• foregone: 'Foregone' suggests something that is predetermined, which does not accurately describe the nature of scientific conclusions being based on observation.
• jump: 'Jump' does not fit grammatically or contextually, as it does not relate to the process of deriving conclusions.