How do a hippopotamus nose and ears help it live under water?

Hippopotamuses have special adaptations that allow them to live in water. Their nostrils are located on top of their head, which allows them to breathe air while most of their bodies are submerged. They can also close their nostrils when underwater to prevent water from entering them. Their ears are also located on top of their heads, which allows them to hear sounds underwater. They can also close their ears to keep water out. These adaptations allow hippopotamuses to spend long periods of time underwater, which helps them to avoid predators and stay cool in the hot African sun.