what are the characteristics fish and seashells ?
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what are the characteristics fish and seashells ?
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The shells of mollusks are their exterior skeletons, providing them with shelter, security from predators and shape. The family of Mollusca, or seashells, includes the clam, oyster, snail, slug and octopus. The soft-bodied part of the seashell has a head, foot, visceral hump and mantle.