Bivalvia

Bivalvia is a class of marine and freshwater animals that includes clams, oysters, mussels, and scallops. They have a soft body protected by two hinged shells, which they can close tightly for defense. Bivalves are filter feeders, meaning they draw in water and extract tiny food particles like plankton. They lack a head and have a simple nervous system. Bivalves play important roles in ecosystems by filtering water and providing habitat for other species. They are also valued by humans for food and pearls. Their unique shell structure and filter-feeding behavior distinguish them within the animal kingdom.