classify = sort
there are many ways to group living things
you can classify animals into two main groups. vertebrates and in vertebrates.
all vertebrates have have ...
Invertebrates
- 90% of all animals are invertebrates!
- tend to be small because they do not have a backbone
- many live in the ocean because the water supports their weight
- some have a hard covering or shell on the outside of their bodies for protection
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