An example of postzygotic hybrid sterility is?
a)the birth of a sterile mule for the mating of a horse and a donkey
b)the elaborate mating ritual of many bird species that them pick a fertile mate.

reproductive isolation reproductive isolation is classified as whether it?
a) occurs before or after fertilization.
b)is related to geography or anatomy

sometimes two species have ranges that overlap but have different periods of sexual activity or breeding seasons. this prezygotic barrier is called?
a) behavioral isolation. b)temporal isolation.