Question

fishes : amphibians : : mammals : ?​

Answer 1

Answer:

The five most well known classes of vertebrates (animals with backbones) are mammals, birds, fish, reptiles, amphibians. They are all part of the phylum chordata -- I remember "chordata" by thinking of spinal chord. There are also a lot of animals without backbones.

Answer 2

Answer:

I hope you got your answer