The gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. The gray frog was abundant in the woodlands. Because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. In such a case, the
population of gray tree frogs will likely decrease
.The gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. This suggests that speciation occurred because of
prezygotic isolation
Explanation:
The terrain is changing to a point in which it would be unsuitable for grey tree frogs and highly suitable for green tree frogs.
Prezygotic isolation prevents the fertilization of eggs. If the two frogs have different mating calls then they won't mate with eachother.
