👉 Mollusk, in biology, refers to a group of marine gastropod mollusks. These are large, cephalopods that have a shell or a shell-like structure on their exterior surface and are generally found in freshwater environments. They are known for their unique body shape, which is characterized by the presence of a long, slender snout with a hard, tough outer layer of epiblast (shell) covering the inside of the snout. The mollusks' bodies