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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.
Mollusca Worksheet 1. For what purpose do mollusks use their muscular foot? 2. How is the muscular foot of a squid different from that of clams and snails? 3. What is a mantle and where is it located in most mollusks? 4. What is contained in the visceral mass? 5. How do most sessile and burrowing mollusks obtain food? 6. What kind of digestive tract do mollusks have? 7. How do the nervous systems of clams and octopuses differ? 8. How do mollusks reproduce; sexually, asexually, or both? 9. Where does fertilization take place in mollusks?