'''Mollusc''' is a group of invertebrate animals, mainly marine in origin. Their bodies do not have an internal skeleton, but may have a hard shell covering the body. These include mussels, oysters, snails, slugs and octopuses. | '''Mollusc''' is a group of invertebrate animals, mainly marine in origin. Their bodies do not have an internal skeleton, but may have a hard shell covering the body. These include mussels, oysters, snails, slugs and octopuses. |