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I just learned this in school, a quote from my notes. In the mollusk family there are 4 groups: Gastropods, the one-shelled if any snails, slugs, and invertebrates like abalone, Bi-Valves, two shells, clams mussels etc. Chitons, 8-shelled, and octopus and squid.

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15y ago

What else can I help you with?