The coral reefs also known as "the rainforest of sea" in wildlife are very unique and can't be replaced to anything else because of the diversity of organisms. Every coral reefs have certain differences as well as similarities among each such as the color, body structure, food, deepness of water where corals are located, and so on. For example, fish that live in cold water cannot live in hot tropical water simply because their body aren't adapted to the environment, and vice-versa. Also, there are hundreds of marine species you only can see in coral reefs so you can find fish you have never seen. Fish that live in coral reefs have a tendency to have a colorful body which is one of their adaptations for survival.