They go through metamorphosis. 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.