A) a niche
B) a biogeochemical cycle
C) an ecosystem
D) a food chain
Correct Answer: C
Solution :
In a given area, the biotic assemblage of all the organisms, plants as well as animals (ie, communities) interacts with its physical environment in such a manner that there is a flow of energy leading to clearly defined trophic structure, biotic diversity and material cycles within a system, known as an ecological system or an ecosystem.
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