In some parts of the world there are some large wooded areas, especially in South America, Africa, and Southeast Asia. These woods are called rain forests, and they make much of the air for the entire planet Earth. In rainforests there are millions of living things. These living things are important to the health of the forest. Bugs and worms burrow in dead plants to help make soil.
Trees grow in the soil.
Animals and birds live in the trees and eat seeds, nuts and fruits. They help plant more trees so there are always fresh trees when old trees die. That is why it is important to understand every kind of living thing. Sometimes even scientists do not understand the job that a single plant or animal does. But scientists know that every job in nature is important.