They all start with gill slits. Fish and some amphibians grow to have gills. Some amphibians, reptiles, birds, and mammals develop lungs to breathe ar They all start with tails. Fish, some amphibians, reptiles, and birds grow tails. Humans do not keep their tails. Fish and reptiles develop scales. Amphibians, birds, and humans have skin. Birds have feathers, and humans have hair.

Fish, amphibians, reptiles, birds, and mammals have similar embryos.

Which two animals exhibit the most linear relationship? (1 point)

O amphibians and reptiles

O amphibians and fish

Obirds and reptiles

Obirds and humans