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Mollusks are a diverse phylum of invertebrate animals, encompassing a wide range of species both terrestrial and aquatic. They are characterized by their soft bodies, which are often protected by a hard shell made of calcium carbonate. Mollusks include well-known animals such as snails, clams, oysters, squids, and octopuses. These creatures exhibit a variety of behaviors and habitats, with some living in freshwater or on land, while others inhabit the ocean depths. Despite their differences, all mollusks share certain features, including a muscular foot that they use for movement, a mantle that secretes the shell, and a complex nervous system. The study of mollusks is an important area of biology, as these animals provide insights into evolution, ecology, and biodiversity.