A passage states: 'The Amazon rainforest produces approximately 20% of the world's oxygen and is home to 10% of all species on Earth.' What is the main idea of this sentence?
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A
The Amazon rainforest is the largest forest in the world.
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B
The Amazon rainforest plays a critical role in global biodiversity and oxygen production.
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C
Ten percent of all species live in South America.
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D
Oxygen is primarily produced by forests.