Amphibians lay eggs. Amphibians have smooth, moist skin. Characteristics of Reptiles Reptiles have backbones. Reptiles are cold-blooded. Reptiles breathe with lungs.
Reptiles lay eggs.
Reptiles have scales or plates. Characteristics of Mammals Mammals have backbones. Mammals are warm-blooded. Mammals breathe with lungs. Mammal babies are born live.