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Biology 7 Online
daisyduck04:

Some invertebrates have a tough out covering called a(n) ___________. endoskeleton exoskeleton spine shell

ILovePuppiesLol:

its exoskeleton... insects have it, its like armor basically

Arcadiouse:

Yeah, it is an exoskeleton. Good job puppies.

daisyduck04:

thanks i actually forgot to close it XD

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