Question

Which of the following is an example of geographic isolation?

A population of salmon dies out because they cannot find food.
A zebra with a long mane moves into a population of zebras with short manes.
A population of squirrels is separated by a mountain range and cannot interbreed.
Two populations of rabbits are forced together after a flood.

Answer 1

A population of squirrels separated by mountain range and cannot interbreed.
The squirrels are divided into two groups by a mountain range.
The two groups continue to breed among themselves and ultimately form different variations and become incapable of interbreeding.