Answer:
A bivalve is a type of mollusk that burrows into the mud or attaches itself to rocks with its foot. A cephalopod is a mollusk with arms or tentacles, such as an octopus.
Step-by-step explanation:
bivalve: Class of mollusks that use their foot to attach themselves to rocks or to burrow into mud, i.e. clams. cephalopod: Class of mollusks characterized by a set of arms or tentacles; i.e. octopus.
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