AP BIOLOGY

Detailed explanation-1: -Phylum Mollusca is a very diverse (85, 000 species ) group of mostly marine species, with a dramatic variety of form. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda.

Detailed explanation-2: -The phylum Mollusca has five classes including chitons, scaphopods, bivalves, gastropods, and cephalopods. Animals in this phylum are characterized by having a soft body with a “head” and a “foot” region, and a mantle that secretes a shell.

Detailed explanation-3: -Mollusks are divided into ten living classes, including the familiar gastropods, cephalopods, and bivalves. Mollusks live in marine and freshwater habitats, as well as on land.

Detailed explanation-4: -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 The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn. The shell of these creatures is often what is recovered in a fossil dig.