Question

A population is

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

Answer 1

A. all individuals of a single species that exist together in a given region.

Explanation:

population relates to the same species, and it can be any species from the plant kingdom or animal kingdom. Population mainly means the amount of species living in an ecosystem (a single ecosystem) in environmental science.