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Mollusks are a diverse group of invertebrate animals found in various aquatic and terrestrial habitats. They are characterized by their soft bodies, which are often protected by hard shells made of calcium carbonate. Many mollusks have a muscular foot that they use for movement and feeding. Some examples of mollusks include snails, clams, oysters, and squid. Mollusks play an important role in the food chain as both predators and prey, and are also economically significant as sources of food, pearls, and other products.