The rainforest contains half of the Earth’s wildlife and at least two thirds of its plant species. It can hold great quantities of water and is very important to the planet’s water cycle. Rainforests remove vast amounts of CO2 from the atmosphere and replace it with oxygen. Which of the following statements best summarize the above information about rainforests?

The passage describes several ways rainforests benefit the planet: they support much of its wildlife and plant life, affect the water cycle, and remove carbon dioxide while releasing oxygen. Together, these details show that rainforests are important to life on the planet as a whole. The passage does not say that most of the planet’s oxygen comes from rainforests or that plants originated there.

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