Question

Classification of vertibrates.

Answer 1

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.

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Answer 2

1) mammals,
2) birds,
3) fish,
4) reptiles,
5) amphibians.