Meaning: 'Adverse' means harmful or unfavorable, particularly in the context of effects on the environment.

Wrong options:

• degradation: 'Degradation' is a noun that refers to the process of deterioration, which does not fit as it does not describe the type of effects.
• perverse: 'Perverse' is an adjective that indicates something that is contrary to what is expected, which does not appropriately describe effects in this context.
• variety: 'Variety' is a noun that refers to a range of different things, which does not fit as it does not describe effects.
• distinction: 'Distinction' is a noun that refers to a difference or contrast between similar things, which does not apply to the context of negative effects.
• susceptibility: 'Susceptibility' is a noun that refers to the likelihood of being affected by something, which does not describe the nature of the effects themselves.
• characteristics: 'Characteristics' is a noun that refers to features or qualities, which does not fit as it does not describe effects.

Correct answer: characteristics

Explanation: The term 'characteristics' is a noun that refers to the features or qualities of the ecosystem. It fits grammatically as it follows 'changes in its' and aligns contextually with the discussion of the ecosystem's attributes affected by pollution.

Meaning: 'Characteristics' refers to the distinguishing features or qualities of something, in this case, the ecosystem.

Wrong options:

• degradation: 'Degradation' is a noun that refers to the deterioration of something, which does not fit as it does not describe the qualities of the ecosystem.
• perverse: 'Perverse' is an adjective that does not relate to the qualities of the ecosystem and is not suitable in this context.
• variety: 'Variety' is a noun that refers to a range of different things, which does not fit as it does not describe the qualities of the ecosystem.
• adverse: 'Adverse' is an adjective that describes negative effects, which does not fit as it does not refer to the qualities of the ecosystem.
• susceptibility: 'Susceptibility' is a noun that refers to the likelihood of being affected, which does not describe the characteristics of the ecosystem.
• distinction: 'Distinction' is a noun that refers to a difference or contrast, which does not fit as it does not describe the qualities of the ecosystem.

Correct answer: degradation

Explanation: The word 'degradation' is a noun that refers to the process of deterioration or decline, fitting grammatically as it follows 'include' and aligns contextually with the ecological consequences of pollution.

Meaning: 'Degradation' refers to the process of something becoming worse or deteriorating, particularly in the context of habitats and biodiversity.

Wrong options:

• perverse: 'Perverse' is an adjective that does not relate to the ecological consequences and is not suitable in this context.
• variety: 'Variety' is a noun that refers to a range of different things, which does not fit as it does not describe a consequence of pollution.
• adverse: 'Adverse' is an adjective that describes negative effects, which does not fit as it does not describe a process or consequence.
• susceptibility: 'Susceptibility' is a noun that refers to the likelihood of being affected, which does not describe a consequence of pollution.
• characteristics: 'Characteristics' is a noun that refers to features or qualities, which does not fit as it does not describe a consequence of pollution.
• distinction: 'Distinction' is a noun that refers to a difference or contrast, which does not fit as it does not describe a consequence of pollution.

Correct answer: susceptibility

Explanation: The term 'susceptibility' is a noun that refers to the likelihood of being affected by disturbances. It fits grammatically as it follows 'greater' and aligns contextually with the discussion of increased vulnerability due to pollution.

Meaning: 'Susceptibility' refers to the state of being likely to be influenced or harmed by something, particularly in the context of disturbances to ecosystems.

Wrong options:

• degradation: 'Degradation' is a noun that refers to the process of deterioration, which does not fit as it does not describe a state of vulnerability.
• perverse: 'Perverse' is an adjective that does not relate to the likelihood of being affected and is not suitable in this context.
• variety: 'Variety' is a noun that refers to a range of different things, which does not fit as it does not describe a state of vulnerability.
• adverse: 'Adverse' is an adjective that describes negative effects, which does not fit as it does not describe a state of susceptibility.
• characteristics: 'Characteristics' is a noun that refers to features or qualities, which does not fit as it does not describe a state of vulnerability.
• distinction: 'Distinction' is a noun that refers to a difference or contrast, which does not fit as it does not describe a state of susceptibility.