The rainforests receive a huge quantity of rainfall, it contains millions of species of insects, microorganisms and plants. The sunlight's penetration is very restrict, but a large part of the world's oxygen comes from them, and also many of the natural medicines. Although the Rainforests are called 'the jewels of the Earth" and "the world's largest pharmacy", the deforestation and pollution of the air are causing its disappeariance.
Selva is another word for forest, like Selva Amazonica.
