Which of these fishes migrated out of freshwater and adapted to life on land?

Nearly all ________ are aquatic.

Features unique to mammals include _____.

What does the term “tetrapod” mean?

A cell membrane is

A cell membrane is

Which of these chordates is not a vertebrate?

Which of these chordates is not a vertebrate?

Match the mammalian group with its description.

Sharks and rays are a type of ________.