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In general, mollusks have 3 body regions: a head, a visceral mass, and a foot.. The head contains the sense organs and brain, while the visceral mass contains the internal organs. The foot is the muscular lower part of the body which is in contact with the substrate.
Snails, oysters, clams, octopuses, and squids are examples of mollusks. â¢ The body cavity in mollusks is a true coelom. â In animals that have a coelom, the gut and other internal organs are suspended from the body wall and are cushioned by the fluid within the coelom.dditions and changes to the original content are the responsibility of the instructor. Mollusks and Annelids continued â¢ Marine Worms â Marine segmented worms are members of the class Polychaeta, the largest group of annelids.