Which one of the following is the best description of the term “ecosystem”?

A. (a) A community of organisms interacting with one another

B. (b) That part of the Earth which is inhabited by living organisms

C. (c) A community of organisms together with the environment in which they live

D. (d) The flora and fauna of a geographical area

Explanation: An ecosystem comprises a community of living organisms together with their physical environment.

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