Two squirrel populations are prevented from mating with each other because they live on opposite sides of the Colorado River. After thousands of years of evolution, the two populations have become two separate and distinct species. They can no longer mate and produce fertile young with the other squirrel population. This process is an example of
A, speciation
B, resistance
C,fossil record
D, asexual reproduction


This process is an example of speciation. Speciation is the evolution of new species from a single one.

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