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invertebrate An invertebrate is a kind of animal. Any animal that does not have a backbone or skeleton inside its body is called an invertebrate. Worms, insects, spiders, and crabs are some of the invertebrates.
mollusk a member of a group of invertebrate animals that live in water. Most kinds of mollusks live in the ocean and have soft bodies covered by a shell. Snails, clams, squid, and octopuses are examples of mollusks.
scallop a small invertebrate animal that lives in the ocean. A scallop lives inside of two shells that are attached to each other with a kind of hinge. These rounded, ribbed shells protect the scallop's soft body. The hinged shells can be opened and closed using a large muscle of the scallop. People sometimes eat this muscle. Scallops are mollusks and are closely related to clams and mussels. [1/4 definitions]