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Sea shells, referred to as shells or sea shells, are the hard protective outer layer of animals living in the sea. The outer shell is part of the animal's body. Empty shells are often washed up by the coast waves. The shell is empty because the creature inside is usually dead, the software has been eaten by other animals or has decayed, and it has disappeared before it washed ashore.

The term "sea shell" generally refers to the exoskeleton of an invertebrate. Shells are usually found on the beach, and most of the sea shells found on the beach are shells of marine mollusks, in part because they are stronger than other sea shells.

In history and prehistoric times, shells were used for many different purposes. However, sea shells are not the only shells; in different ecological environments, shells can also be found in fresh water, such as freshwater stalks and snails. Snails on land also have protective shells.