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What is an animal that has no backbone or a shell?

April 26, 2017Animal backbone Mathematics Shell zoology

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What is an animal that has no backbone or a shell?

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Invertebrates are animals without a backbone, but many of them have a shell. There is no single term for invertebrates without a shell. Even within one invertebrate group, like mollusks, there are animals with a shell and animals without a shell.