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.

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

birds and humans
birds and humans

amphibians and reptiles
amphibians and reptiles

birds and reptiles
birds and reptiles

amphibians and fish

Answer 1

The two animals that exhibit the most linear relationship based on the provided information are **birds and reptiles**.

Both belong to the class of animals known as amniotes and share several characteristics, such as the development of scales (in reptiles) and feathers (in birds, which are modified scales). Additionally, they have similar features in their evolutionary lineage. In contrast, the relationships among amphibians and fish, as well as humans and birds, are less direct due to significant differences in developmental stages and classifications.