Question

two species of flies, drosophila melanogaster and drosophila simulans, can mate. they usually do not mate, however, even if they are kept together in a laboratory. males court the females of both species, but the females prefer to mate with males of their own species. which isolating mechanism does this describe?
behavioral
temporal
artificial
anatomical

Explanation:

Behavioral isolation occurs when differences in behavior prevent mating. Here, female flies' preference for their own species' males (a behavioral trait) stops inter - species mating. Temporal isolation is about mating at different times. Artificial is not a natural isolation mechanism. Anatomical is about physical incompatibility.

Answer:

A. behavioral