Classify=SORT.
There are many ways to group living organisms.One way is according to how they use their food for energy.Classifying animals,you can classify animals into two main groups,vertebrates or invertebrates.
All vertebrates have:Covering of skin that protects them,Skeleton inside their body,Muscles that help them move,Lungs and gills for breathing.
Invertebrates
90 % of animals are invertebrates!
Tend to be small because they do not have a backbone.
Many live in the ocean because the water helps support their weight.
Some have a hard covering or shell n the outside of their bodies for protection
-Insects,spiders,crabs,snails,clams
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