Meaning: 'Extinction' refers to the state of a species no longer existing, highlighting a critical aspect of biodiversity loss.

Wrong options:

• richness: Richness refers to the number of different species in a given area, which does not directly relate to the loss of biodiversity in the same way as extinction does.
• migration: Migration indicates the movement of species from one place to another, which is not a direct aspect of biodiversity loss.
• diversity: Diversity refers to the variety of species, but it does not specifically denote loss; rather, it describes the presence of multiple species.

Correct answer: coordinated

Explanation: The word 'coordinated' is the correct choice as it indicates that the assessment was organized and managed by the United Nations Environment Programme, fitting grammatically and contextually within the sentence structure.

Meaning: 'Coordinated' means organized or arranged in a systematic way, indicating that the assessment was a collaborative effort.

Wrong options:

• confounded: Confounded means confused or mixed up, which does not fit the context of organizing an assessment.
• consulted: Consulted implies seeking advice or information, which does not accurately describe the role of the United Nations in this context.
• converted: Converted means changed from one form to another, which is unrelated to the process of organizing the assessment.

Correct answer: shrink

Explanation: The verb 'shrink' is appropriate here as it describes a reduction in the area of ecosystems, fitting grammatically and contextually with the sentence's focus on loss.

Meaning: 'Shrink' means to become smaller in size or amount, indicating a decrease in the area of ecosystems.

Wrong options:

• expand: Expand means to increase in size, which contradicts the context of loss being discussed.
• remain: Remain suggests staying the same, which does not convey the idea of loss or reduction.
• extend: Extend means to increase or stretch out, which is opposite to the intended meaning of loss in this context.

Correct answer: prevent

Explanation: The verb 'prevent' fits grammatically and contextually as it indicates the action of stopping losses from occurring, aligning with the overall theme of conservation efforts.

Meaning: 'Prevent' means to stop something from happening, in this case, the losses of biodiversity.

Wrong options:

• praise: Praise means to express approval or admiration, which does not relate to the action of stopping losses.
• accelerate: Accelerate means to speed up, which is contrary to the goal of preventing losses.
• prompt: Prompt means to cause or bring about, which does not fit the context of stopping losses.