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

Choose the correct option.

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

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