Q: In addition to five classes of fish, what other classes make up the species of vertebrates?


Read this paragraph and choose the correct option from the provided answers:

There are about 50,000 living species of vertebrates. They are placed in nine classes: five classes of fish plus amphibians, reptiles, birds, and mammals.

 Choices:

- amphibians , vertebrae , birds , and mammals

- reptiles, birds, mammals, and primates

- insects, amphibians, reptiles, and birds

- amphibians, reptiles, birds, and mammals


A:
amphibians, reptiles, birds, and mammals