What is a self-sustaining association of living plants and animals and their nonliving physical environment?

Out of the following given choices;

A.ecosystem. B.ecotone. C.community. D.niche.

The answer is A. it involves all organisms in an enviroemt inerracting with each other , example throguh parasitism, predation, symbiosis, and etcetera. The organism also interact with abiotic factors in the enviroemnt such as water, air, nutrients, and etcetera

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