All mollusks build their own shells, whether they live in water or on land. Creatures like snails, clams, oysters and mussels use an organ called a mantle to secrete layers of calcium carbonate ...

A seashell is formed by a mollusk’s outermost layer of tissue called the mantle. The mantle is what connects the mollusk to its shell, and the mantle is what supports the continual growth of the ...

The arms are also important for a defensive display in which the cuttlefish sucks water into its mantle cavity and spreads its arms in order to appear larger to its potential opponent. The ...