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Biology stufff! Animals and classificiations. O:... And candy!

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Okay, so I have finals tomorrow and I'm sure this question is going to be on it.
"what characteristics define an animal?"
I know they're multi-cellular and lack cell walls and are motile or sessile. But what else?

To classify animals is it...
Porifera, cnidarians, platyhelminthes, nemotada, mollusca, annelida, echinoderm, anthropods, chordata.
Or am I totally wrong?

Pleaaase. Help.