What are three mechanisms for reproductive isolation? Which mechanism isolates two populations of similar frogs with different mating calls?

Answer 1

The isolation happening here is behavioral isolation, because their different behavior patterns prevent the frogs from breeding.

Answer 2

the three mechanisms are 1) mechanical 2) ecological 3) behavioral. the mechanism that would isolate two populations of similar frogs with different mating cells would be mechanical. (ex if a female of one species of frogs tries to mate with the male of another species, their reproductive organs won't match with one another and the two species won't be able to mate.)