Vertebrates and invertebrates
Organisms with backbone and organisms without backbones
Examples: seahorse,clown fish, and trout.
Examples: frogs, and salamander
Examples: alligator, crocodile, snake, lizards.
Mammals are warm blooded.some examples of mammals are kangaroo, mice, and dolphins. You may of here that all mammals have live birth, but not all do. Platypus are mammals but they still have eggs.