Biology

The correct answer is: C.Populations become geographically or physically separated.

Explanation:

Allopatric speciation occurs when a population becomes geographically isolated, such as by a physical barrier (e.g., a mountain range, river, or desert). This isolation prevents gene flow between the separated populations, leading to genetic divergence over time. As the populations adapt to their new environments, they can accumulate genetic differences, and eventually, they may become distinct species.

The other options describe different concepts:

A.Species occupy different roles i...