Question

which phrase describes a population?
a group of different communities in an area
organisms of the same species living in an area
nonliving things that interact with living things in a region
organisms that belong to the same community within a region

Explanation:

A population in biology is defined as a group of individuals of the same species that live in the same geographic area and can interbreed. The other options describe ecological concepts: the first is a landscape/collection of communities, the third is abiotic factors interacting with biotic factors, and the fourth refers to a subset of a community, not a population.

Answer:

organisms of the same species living in an area