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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.
Slugs and snails are molluscs, like oysters and clams. They are both similar in structure, except that the snail is protected by a hard shell that makes it less vulnerable than slugs to dry conditions and the sun.Slugs and snails have a soft, unsegmented body that is 2 to 4 cm (.79 to 1.5 inches) long.The head has one or two pairs of tentacles. The front tentacles are sensitive to odours and sometimes taste, while each of the larger back tentacles have an eye at the end.lugs and snails are known as gastropods, which means stomach foot.. The foot located on the stomach is how they move around. Slugs and snails are also hermaphrodites, with both male and female organs.