Show by example the adaptability of aquatic animals to their environment.

Every living creature is forced to either adapt to its environment, or immigrate or die. Regardless of class, species or genus. The clearest example of the adaptation of two animals of different classes to their habitat can be found in the aquatic environment. In order to survive, they develop characteristic organs that allow them to survive. Examples of this are animals such as the whale, the dolphin is a mammal, and the shark is a fish. Both those and others acquired similar features, such as streamlined body shapes, fins. They allow you to exist in the same environment. The process of finding common features is called convergence.