One of the main differences between amphibians and reptiles is that juvenile amphibians undergo metamorphosis during which they change from using gills for respiration to using their lungs. Another significant difference is that reptiles have scaly skin, while amphibians have moist skin. Reptiles reproduce by leathery or soft hard eggs laid on land or maintained inside the body until hatching.
Amphibians reproduce soft eggs typically laid in water or media. The amphibian egg is a yolk sac enveloped in one or more layers of a certain jelly-like covering. The reptile egg is self-contained and protects the embryo from dehydration. Reptiles are alligators, lizards, snakes, and turtles. Amphibians are frogs, toads, salamanders, and newts.