Question

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.

With which animal do humans exhibit the most linear relationship? (1 point)

O amphibians

reptiles

birds

fish h

Answer 1

birds

Reason: Birds and humans (mammals) share more of the listed features (embryonic gill slits and tails, development of lungs, and similar integumentary structures — feathers vs hair) and are closer together on the listed evolutionary line than amphibians or fish.