Tropical rainforests are mainly distributed near the equator, where the soil is fertile, rainfall is abundant, and there are many kinds of plants, animals and other organisms in various shapes. The tropical rainforest not only provides an ideal living environment for organisms, but more importantly, it absorbs a large amount of carbon dioxide through photosynthesis, converts it into organic matter, and stores it in the plants; at the same time, it releases a large amount of oxygen, maintaining the carbon-oxygen balance in the biosphere, and is therefore called the "lungs" of the earth. Therefore, the answer is: The tropical rainforest not only provides an ideal living environment for organisms, but more importantly, it absorbs a large amount of carbon dioxide through photosynthesis, converts it into organic matter, and stores it in the plants; at the same time, it releases a large amount of oxygen, maintaining the carbon-oxygen balance in the biosphere, and is therefore called the "lungs" of the earth.