Question

unit review - evolution of populations allopatric speciation occurs when two populations become separated by a geographic feature such as the grand canyon, shown here in this image. since they are now isolated, the populations cannot reproduce with each other leading to the development of two distinct species (speciation). the squirrels in population \a\ cannot reproduce with the squirrels in population \b.\ why cant the squirrels in the \a\ population reproduce with the squirrels in the \b\ population? they are separated by a geographic barrier called the grand canyon. they simply choose not to reproduce, at all. they are too busy to reproduce.

Explanation:

Allopatric speciation occurs due to geographic isolation. The Grand Canyon acts as a barrier preventing inter - population reproduction.

Answer:

They are separated by a geographic barrier called the Grand Canyon.