Our planet and its ecosystems are full of all kinds of different living organisms.

The picture on the right shows life on a coral reef. 

The turtle in the picture is a reptile. In the background, you can see a school of fish swimming and searching for food. Both reptiles and fish are animals. More precisely, they are vertebrates.

The coral itself is comprised of the supporting structures of invertebrate animals.

Primitive plants known as algae live on top of these coral structures.