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

Answer 1

birds

Reason: Humans and birds both develop lungs (not gills), have skin rather than scales, and share other advanced traits (e.g., warm-bloodedness) that make them more similar than to fish, reptiles, or amphibians.