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.
1 Mollusks are soft-bodied animals, which often live in hard shells. 2  They include snails, slugs, octopus, squid, mussels, oysters, clams, scallops, chitons, and cuttlefish. 3  Mollusks are the second-largest group of invertebrates, with 50,000 living species. 4  Arthropods are the largest and most diverse of all animal groups.