Biology

The correct answer is: A.Allopatric speciation

Explanation:

When populations are separated by a mountain range, they become geographically isolated from one another. This isolation prevents gene flow between the populations, and over time, the populations may evolve into distinct species due to different environmental pressures or genetic drift. This is a classic example of allopatric speciation, where a physical barrier (like a mountain range) causes the populations to evolve independently.

A.Allopatric speciation occurs when a physical barrier, such as a mountain range, river, or desert, divides a population, leading to the formation of new species....