A phylum of the kingdom Metazoa. mollusca have soft, unsegmented bodies with an anterior head, a dorsal visceral mass, and a ventral foot. Most are encased in a protective calcareous shell. It includes the classes gastropoda; bivalvia; cephalopoda; Aplacophora; Scaphopoda; polyplacophora; and Monoplacophora.

Symptoms and diagnosis



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