Read the article about tropical rainforests and choose the best words to complete it.

Choose the correct option.

Tropical rainforests are extremely important to life on our planet. They are the ecosystems of our planet, and they enrich the atmosphere with moisture. Rainforests also keep the [gas|planet] cool. Thanks to these forests, the Earth's [atmosphere|soil] becomes cooler by capturing and storing billions of tons of carbon. Aeroplanes, cars, and power plants [emit|recycle] toxic substances, but rainforests can produce a lot of oxygen. They help our planet maintain the right climate.

There is a rich combination of animals and [factories|plants] that live in rainforests. They give us food, [ingredients|poison] for medicine, and many other things. People need these resources, but we also [do|need] to protect tropical rainforests. If we don't think about it, we can lose rare trees, animals, and species.