The physical design of the whale is very complex, and it is why they are able to survive in the water. They depend on their flippers and their dorsal fins to help them move in the water and to stay balanced. They also have blowholes at the top of them where they take in air. Then they can be submerged under the water for a period of time before they need to take another breath. This is a characteristic of whales that definitely separates them from the majority of aquatic life out there.