Since the Pleistocene ice age, deserts have been gradually forming in the southwestern United States. As the original lakes and rivers of this area shrank into isolated streams, ponds, and springs, the fishes living in them developed a strong potential for:

Question

Quizplus · Accepted Answer

The formation of deserts in the southwestern United States led to the isolation of fishes in small bodies of water, which could lead to speciation over time as different populations adapt to their specific environments.

Since the Pleistocene Ice Age, Deserts Have Been Gradually Forming