How can diversity can be maintained in a system where there is competition for r

Question

How can diversity can be maintained in a system where there is competition for resources among species? (choose all that are correct)
A. When natural selection causes traits to become different enough from those of competitors so that a species can use a resource in its own independent way
B. When species occupy different niches, even if they aren't the best conditions for them, but are the only ones where they can compete.
C. Diversity can only be maintained when there is an absence of competition for resources
D. When there is variation in the environment, either in space or time

Explanation / Answer

Answer - A. When natural selection causes traits to become different enough from those of competitors so that a species can use a resource in its own independent way.

D. When there is variation in the environment, either in space or time

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