Which mollusk group can be described as having several calcium carbonate plates along their dorsal side?

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Chitons are a group of mollusks characterized by having multiple calcium carbonate plates or "valves" along their dorsal side, which provide protection and flexibility. Bivalves have two shells that are connected at a hinge, gastropods have a single coiled shell or no shell, and cephalopods have no external shell (except for some species that have a reduced internal shell).

Which Mollusk Group Can Be Described as Having Several Calcium