~Seashell~

~ Hard, protective outer layer~
A seashell or sea shell is a hard, protective outer layer usually created by an animal or organism that lives in the sea. Most seashells are made by molluscs, such as snails, clams, and oysters, to protect their soft insides. The shell is composed largely of calcium carbonate secreted by the mantle, a skin like tissue in the mollusc's body wall 🐚