Mollusks are a diverse group of invertebrate animals that include clams, mussels, snails, octopuses, and squids, among others. They are characterized by having a soft body, often protected by a calcareous shell.
Mollusks can live in a variety of habitats, such as oceans, rivers, lakes, and moist soils. Many mollusks have a muscular foot that they use for movement, and some have tentacles or arms for feeding or capturing prey.
They are important for marine and freshwater ecosystems, playing roles as filter feeders, herbivores, and predators.
