Why does the crab live in the water?

Crabs primarily live in water because they are aquatic animals that rely on gills to extract oxygen from water, which is essential for their survival. Living in marine or freshwater environments provides them with food sources, such as algae, plankton, and small fish. Additionally, water offers a habitat for reproduction and protection from predators. While some crabs can survive on land for short periods, their physiological adaptations are best suited for aquatic life.