Sea shells are the protective outer coverings of marine mollusks such as snails, clams, oysters, and mussels. These shells are primarily composed of calcium carbonate and are secreted by the mollusk's mantle, a specialized tissue responsible for shell formation.Sea shells come in a variety of shapes, sizes, colors, and patterns, depending on the species of mollusk that produces them and the environmental conditions in which they develop. Some shells are smooth and glossy, while others may be rough or spiky.Humans have long been fascinated by sea shells for their beauty and diversity
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