fish amphibians, reptiles, birds, and mamals have similar embryos they all start with gill slits fish and some amphibians, reptiles, birds, and mammals develop lungs to breath air. they all start with tails. fish, some amphibians, reptiles, and birds grow tails. humans do not keep their tails. fish and reptiles devlop scales. amphibians, birds, and humans have skin, birds have feathers and humans have hair

which two animals echibit the most linear relationship
birds and reptiles
birds and humans
amphibians and fish
amphibians and reptlies