Transform Boundaries The final type of boundary is one where the two plates slide against each other in a sideways motion. These boundaries between plates is referred to as transform boundaries.
The three regions of the body of the Mollusk are the head-foot, the visceral mass, and the mantle-shell.
Mollusks are a phylum of invertebrate animals defined by their distinct body structure -- a head, a visceral mass, a mantle and some kind of foot.ivalves. Clams, limpets, mussels, oysters and scallops are the most common types of bivalves, which also are mollusks. Bivalve means two shells, which is what these creatures have instead of a bone structure. Bivalves are filter feeders.