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Mollusks are a diverse phylum of invertebrate animals, encompassing a wide range of species found both in aquatic and terrestrial habitats. They are characterized by their soft bodies, which are often protected by hard shells made of calcium carbonate. The majority of mollusks have a muscular foot, which they use for movement or attaching themselves to surfaces. Some examples of mollusks include snails, clams, oysters, squid, and octopuses. They have a complex organ system including a nervous system, digestive system, excretory system, reproductive system, circulatory system and respiratory system. They also have a unique organ called mantle which helps in secreting the shell and also aids in respiration. Mollusks play important roles in the ecosystem as decomposers, scavengers, and prey for other animals.