Certain mollusks, such as snails and clams, belong to a diverse group of soft-bodied animals. They are characterized by their unsegmented bodies, which are often protected by a hard shell made of calcium carbonate. Mollusks can be found in various environments, including oceans, freshwater, and land. These creatures play important roles in their ecosystems. For example, snails help decompose organic matter, while clams filter water, improving its quality. Mollusks also serve as a food source for many animals, including birds and humans, who consume them in various dishes.