Macroevolution: Speciation and Phylogeny

Question 1

A population of 100 squirrels lives in a lush green valley. A sudden earthquake changes the flow of the local river, causing it to diverge through the center of the valley. About 45 squirrels are trapped on th east river bank, while the other 55 squirrels are trapped on the west river bank. The river is impassable. After thousands of years, the two sub-populations of squirrels accumulate differences that make them reproductively isolated.

Answer 1

Allopatric Speciation via Vicariance