A population is A. all plant species that exist in a single region at a single time. B. all individuals of a single species that exist together in a given region. C. the sum of all individuals of a species that live in different ecosystems. D. all similar animal species that live in the same ecosystem.

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Answer:

B

Explanation:

a population in the ecosystem can  be defined as all the individual of a species that exist together at a given place and time.