NEET BIOLOGY

Detailed explanation-1: -The phylum Mollusca is the second-largest animal phylum, with over 100, 000 species. The molluscs include many familiar animals, including clams, snails, slugs, and squid, as well as some less familiar animals, like tusk shells and chitons (Fig. 3.51 A).

Detailed explanation-2: -Mollusca is one of the most diverse groups of animals on the planet, with at least 50, 000 living species (and more likely around 200, 000). It includes such familiar organisms as snails, octopuses, squid, clams, scallops, oysters, and chitons.

Detailed explanation-3: -The Class Gastropoda (in Phylum Mollusca) includes the groups pertaining to snails and slugs. The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn.

Detailed explanation-4: -Mollusks, a collection of invertebrates that includes nudibranchs, slugs, snails, chitons, clams, oysters, scallops, mussels, cuttlefishes, octopuses, squids and many other familiar creatures, are a successful group of animals.