Encyclopedia of Life Amphibians. Amphibians are cold-blooded animals that metamorphose from a young, water-breathing form to an adult, air-breathing form.
Earth Science 13.2B Paleozoic Era : Life explodes Paleozoic Era : Life Explodes: Part B.
Reptiles & Birds Chapter 31. Reptiles What is a Reptile? Snakes, turtles, alligators, and lizards are an extremely diverse group of animals, yet all.
The Skull and Visceral Skeleton
