Earths history which of the following is the best example of an index fossila. animal paw printb. a trilobite fossil c. a dinosaur bone d. a fern print on a rock which best signifies the reason for extinction of various species a. climactic events b. natural selection c. survival of the fittest d. disease

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 .