NEET BIOLOGY

Detailed explanation-1: -Many organisms belonging to this phylum have a calciferous shell. The bodies are generally very soft and are covered by the hard exoskeleton.

Detailed explanation-2: -Molluscs are a clade of organisms that all have soft bodies which typically have a “head” and a “foot” region. Often their bodies are covered by a hard exoskeleton, as in the shells of snails and clams or the plates of chitons.

Detailed explanation-3: -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.

Detailed explanation-4: -Mollusks have neither endoskeletons nor exoskeletons. While they are protected by a shell that attaches to their body, their shells differ from exoskeletons in several ways.

Detailed explanation-5: -Mollusks are a large group of invertebrate animals. Mollusks have soft bodies, and their bodies are not divided into rings like the segmented worms called annelids .