The following questions refer to the paragraph and graphs below.
In a hypothetical situation, the National Park Service, which administers Grand Canyon National Park in Arizona, builds a footbridge over the Colorado River at the bottom of the canyon. The footbridge permits interspersal of two closely related antelope squirrels. Previously, one type of squirrel had been restricted to the terrain south of the river, and the other type had been restricted to terrain on the north side of the river. Immediately before and ten years after the bridge's completion, ten antelope squirrels from both sides of the river were collected, blood samples were taken, and frequencies of alleles unique to the two types of antelope squirrels were determined (see graphs below).

-Which of the following statements about speciation is correct?
A)The goal of natural selection is speciation.
B)When reunited, two allopatric populations will not interbreed.
C)Natural selection chooses the reproductive barriers for populations.
D)Prezygotic reproductive barriers usually evolve before postzygotic barriers.
E)Speciation is a basis for understanding macroevolution.

Two Species of Frogs Belonging to the Same Genus Occasionally

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