Fish amphibians reptiles, birds, and mammals have similar embryos They all start with gill slits Fish and some amphibians grow to have gills. Some amphibians, reptiles, birds, and mammals develop lungs to breathe air 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
Which two animals exhibit the most linear relationship?
A: amphibians and fish
B: amphibians and reptiles
C: birds and humans
D: birds and reptiles