Two species of squirrels live on either side of the Grand Canyon. They are an example of:
A) mechanical isolation.
B) hybrid inviability.
C) temporal isolation.
D) allopatric speciation.

Question

Quizplus · Accepted Answer

The two species of squirrels living on either side of the Grand Canyon are separated by a physical barrier (the Grand Canyon itself), which prevents them from interbreeding. This geographical separation leading to speciation is known as allopatric speciation.

Two Species of Squirrels Live on Either Side of the Grand