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slug Created with Sketch. Science Questions How do seashells form?

How do seashells form?

Oysters, clams, snails, and certain other kinds of mollusks make seashells. The shells help protect these animals’ soft bodies from dangers such as parasites, sharp objects, heavy-footed animals, and especially from animals that would try to eat them. A shell grows as the surface of the mollusk’s body secretes a chemical that contains calcium, the same element that makes bones hard. The calcium helps form the hard shell, and when the mollusk dies, the shell is left behind.

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