Question

sub phylum vertebrate is further divided into _______ classes

Answer 1

There are about forty thousand species of vertebrates placed into one phylum, Chordata, which is divided into eight different classes: (1) class Aves (birds), (2) class Fish, (3) class Reptilia (reptiles), (4) class Mammalia (mammals), (5) class Amphibia (amphibians).

40000

Answer 2

6 classes
1-aves
2-mammals
3-reptiles
4-amphibians
5-chondrichthyes
6- osteichthyes