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?
a.fish
b.amphibians
c.reptiles
d.birds
c. reptiles
Humans exhibit a closer linear relationship with reptiles because they both develop scales at some point in their embryonic development. While humans do not maintain scales throughout their life like reptiles do, this shared characteristic during embryonic development suggests a closer relationship between humans and reptiles compared to other animals listed.