EVERYDAY SCIENCE

Detailed explanation-1: -In phylum Mollusca, the animals have a soft, unsegmented body, with a hard, calcareous shell to protect the soft body. They have a muscular foot to help locomotion and act as a weapon in some cases. Example: Snail, slug, oyster, mussel, clam, squid and octopus.

Detailed explanation-2: -Although extremely diverse, molluscs have some common characteristics such as a soft, unsegmented body, a muscular foot or tentacles and a mantle that can secrete a shell.

Detailed explanation-3: -Molluscs have a mantle or mass of soft flesh that covers the soft body and encloses the internal organs. In many species, the mantle produces a hard shell. Not all molluscs produce a shell.

Detailed explanation-4: -mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.

Detailed explanation-5: -The mollusc (or mollusk) shell is typically a calcareous exoskeleton which encloses, supports and protects the soft parts of an animal in the phylum Mollusca, which includes snails, clams, tusk shells, and several other classes. Not all shelled molluscs live in the sea; many live on the land and in freshwater.