GENERAL HISTOLOGY

Detailed explanation-1: -Class Bivalvia are molluscs with hinged two-part shells (Fig. 3.51 C). Examples include clams, oysters, mussels, and scallops. Class Cephalopoda are molluscs with large heads, large eyes, and grasping tentacles (Fig.

Detailed explanation-2: -The Aplacophora class is made up of approximately 300 species of small worm-like animals that lack a shell. Instead, they have an outer skeleton that is composed of tiny spicules made of calcium.

Detailed explanation-3: -A bivalve is an animal that has two hinged shells, which are called valves. All bivalves are mollusks. Examples of bivalves are clams, mussels, oysters, and scallops. Bivalves are found in both freshwater and marine environments.