NEET BIOLOGY

Detailed explanation-1: -mol·lusk ˈmä-ləsk. variants or mollusc. : any of a large phylum (Mollusca) of invertebrate animals (such as snails, clams, or squids) with a soft unsegmented body usually enclosed in a calcareous shell. broadly : shellfish.

Detailed explanation-2: -Mollusks are invertebrates (animals without a backbone) with soft bodies. Their bodies are not divided into different segments or parts. Mollusks often have a hard outer shell to protect their bodies. All mollusks have a thin layer of tissue called a mantle which covers their internal organs.

Detailed explanation-3: -clams, mussels, oysters, and scallops (class Bivalvia) octopi, squid, cuttlefish, and nautili (class Cephalopoda) snails and slugs (class Gastropoda) class Monoplacophora. class Polyplacophora.

Detailed explanation-4: -Molluscs are soft-bodied animals that have a protective calcareous shell covering it. This shell is secreted by a soft, spongy layer called mantle that lies over the visceral hump, also called the visceral mass. The shell is calcareous as it is made up of calcium carbonate.