Two Different Species of Three-Spined Stickleback Fish Have Been Found

Two different species of three-spined stickleback fish have been found together in each of five different lakes.Within the same lakes, the larger bottom-dwelling species with a large mouth feeds on large prey close to shore.A smaller surface-dwelling species feeds on small plankton in open water.DNA analysis shows that the two species in each lake are more closely related to each other than they are to any of the other species in the lakes.However, they are reproductively isolated.The habitat specialization of these species is consistent with which prezygotic mechanism that can lead to speciation?

A) Temporal isolation
B) Habitat isolation
C) Mechanical isolation
D) Behavioral isolation
E) Gametic isolation

Correct Answer:

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