Which statement is correct about the faunas during one of the five major events a
The event at the end of the Devonian (Dev.) resulted in an increase in the number of Cambrian faunas.
b
The event at the end of the Cretaceous resulted in an increase in the number of Paleozoic faunas.
c
The event at the end of the Triassic (Tri.) resulted in the extinction of fewer faunas than in any other period.
d
The event at the end of the Cretaceous resulted in the extinction of more faunas than in any other period.

The images show two species of tree frogs in a particular region. 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 . 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 .