Meaning: 'Exposure' means the state of being subjected to something, particularly something harmful or dangerous, which in this context refers to nanoplastics.

Wrong options:

• arrangement: 'Arrangement' refers to the act of organizing or structuring something, which does not fit the context of being subjected to nanoplastics.
• indifference: 'Indifference' means a lack of interest or concern, which is not relevant to the context of the study about the effects of nanoplastics.
• aversion: 'Aversion' indicates a strong dislike or avoidance, which does not accurately describe the interaction with nanoplastics as discussed in the study.

Correct answer: awareness

Explanation: The word 'awareness' is appropriate as it refers to the knowledge or perception of a situation or fact. It fits contextually as the authors aim to increase understanding of health risks associated with nanoplastic pollution.

Meaning: 'Awareness' means being conscious of and informed about something, in this case, the health risks posed by nanoplastics.

Wrong options:

• compensation: 'Compensation' refers to something given to make up for a loss or injury, which does not relate to raising knowledge about health risks.
• data: 'Data' refers to facts and statistics collected for reference or analysis, which does not fit the context of increasing public understanding.
• access: 'Access' means the means of approaching or entering a place, which is not relevant to the goal of increasing knowledge about health risks.

Correct answer: equivalent

Explanation: The word 'equivalent' functions as an adjective that describes something as equal in value or meaning. It fits grammatically and contextually, indicating that the amount of plastic consumed is comparable to a credit card.

Meaning: 'Equivalent' means equal in value, amount, function, or meaning, highlighting the comparison being made.

Wrong options:

• the equivalence: 'The equivalence' is a noun phrase that does not fit grammatically in this context, as the sentence requires an adjective.
• its equivalence: 'Its equivalence' also functions as a noun phrase, which does not fit the grammatical structure needed here.
• that equivalent: 'That equivalent' is awkward and does not fit grammatically, as it lacks the necessary context to serve as a descriptor in this sentence.

Correct answer: adverse

Explanation: The term 'adverse' is an adjective that describes something harmful or unfavorable. It fits both grammatically and contextually, indicating that the effects of microplastics and nanoplastics are negative.

Meaning: 'Adverse' means having a negative or harmful effect, which is relevant to the discussion of the impact of these substances on biological systems.

Wrong options:

• neutral: 'Neutral' means not taking sides or having no effect, which contradicts the context of harmful effects being discussed.
• flawed: 'Flawed' refers to having imperfections or faults, which does not accurately describe the nature of the effects being studied.
• declining: 'Declining' suggests a decrease or reduction, which does not fit the context of discussing harmful effects.

Correct answer: disruption

Explanation: The word 'disruption' is a noun that refers to a disturbance or interruption of a process. It fits grammatically and contextually, indicating that endocrine functions are being negatively affected.

Meaning: 'Disruption' means a disturbance that interrupts or impedes a process, relevant to the context of endocrine functions being affected by microplastics.

Wrong options:

• controversy: 'Controversy' refers to a disagreement or debate, which does not fit the context of discussing the effects on biological systems.
• stability: 'Stability' means the state of being stable or steady, which is the opposite of what is being described regarding the effects of microplastics.
• labor: 'Labor' refers to work or effort, which is unrelated to the context of biological effects being discussed.