Meaning: 'Active' means being engaged or involved in a particular activity or process.

Wrong options:

• adverse: 'Adverse' is an adjective that means harmful or unfavorable, which does not describe the participants' role in investigations.
• vast: 'Vast' is an adjective meaning very large in size or extent, which does not appropriately describe the nature of the participants' involvement.
• necessary: 'Necessary' is an adjective indicating something that is essential or required, which does not fit the context of describing participants.
• significant: 'Significant' is an adjective that means important or noteworthy, but it does not accurately describe the participants themselves.
• provide: 'Provide' is a verb meaning to supply or make available, which does not fit grammatically as it cannot modify 'participants.'
• undertaken: 'Undertaken' is a past participle verb that means to have taken on a task or responsibility, which does not fit as an adjective to describe participants.

Correct answer: undertaken

Explanation: The term 'undertaken' is the past participle of the verb 'undertake,' which means to take on a task or responsibility. It fits grammatically as it describes the action the team has performed regarding their new research.

Meaning: 'Undertaken' means to have taken on or begun a particular task or project.

Wrong options:

• adverse: 'Adverse' does not fit as it is an adjective and does not convey an action related to research.
• vast: 'Vast' is an adjective that does not describe an action and is irrelevant in this context.
• make: 'Make' is a verb that does not fit grammatically as it does not convey the action of conducting research.
• necessary: 'Necessary' is an adjective that does not describe an action and is not relevant here.
• significant: 'Significant' is an adjective that does not convey an action and does not fit the context of research.
• active: 'Active' is an adjective that describes a state of being, not an action taken by the team.
• provide: 'Provide' is a verb that does not fit grammatically in this context.

Correct answer: make

Explanation: The verb 'make' fits grammatically as it indicates the action of creating or causing a contribution. It aligns with the context of discussing the impact of melting ice caps on sea levels.

Meaning: 'Make' means to create or cause something to happen.

Wrong options:

• adverse: 'Adverse' is an adjective that does not fit as it does not convey an action related to contributing.
• vast: 'Vast' is an adjective that does not describe an action and is irrelevant in this context.
• necessary: 'Necessary' is an adjective that does not convey an action and is not relevant here.
• significant: 'Significant' is an adjective that does not fit grammatically as it cannot indicate an action.
• active: 'Active' is an adjective that does not convey an action and is not appropriate in this context.
• provide: 'Provide' is a verb that does not fit grammatically in this context as it does not indicate the action of contributing.

Correct answer: significant

Explanation: The word 'significant' is an adjective that describes the contribution as being important or considerable. It fits grammatically as it modifies the noun 'contribution' and aligns with the context of discussing the impact of melting ice caps.

Meaning: 'Significant' means important or having a major effect.

Wrong options:

• adverse: 'Adverse' is an adjective that means harmful or unfavorable, which does not accurately describe the nature of the contribution.
• vast: 'Vast' is an adjective meaning very large in size or extent, which does not appropriately describe the contribution's importance.
• make: 'Make' is a verb that does not fit grammatically as it cannot modify 'contribution.'
• necessary: 'Necessary' is an adjective indicating something that is essential or required, which does not fit the context of describing the contribution.
• active: 'Active' is an adjective that describes a state of being, not the nature of the contribution.
• provide: 'Provide' is a verb that does not fit grammatically in this context.

Correct answer: adverse

Explanation: The word 'adverse' is an adjective that describes the effects as being harmful or unfavorable. It fits grammatically as it modifies the noun 'effects' and aligns with the context of discussing the negative implications of climate change.

Meaning: 'Adverse' means harmful or unfavorable.

Wrong options:

• vast: 'Vast' is an adjective meaning very large in size or extent, which does not accurately describe the nature of the effects.
• make: 'Make' is a verb that does not fit grammatically as it cannot modify 'effects.'
• necessary: 'Necessary' is an adjective indicating something that is essential or required, which does not fit the context of describing the effects.
• significant: 'Significant' is an adjective that means important or noteworthy, but it does not accurately describe the negative nature of the effects.
• active: 'Active' is an adjective that describes a state of being, not the nature of the effects.
• provide: 'Provide' is a verb that does not fit grammatically in this context.