Question

why the Amazon forest(river Basin) is called the lungs of the world?...
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Answer 1

Tropical rainforests are often called the “lungs of the planet” because they generally draw in carbon dioxide and breathe out oxygen. But the amount of carbon dioxide they absorb, or produce, varies hugely with year-to-year variations in the climate. A new paper published this week in the journal Nature shows that these variations reveal how vulnerable the rainforest is to climate change.

Answer 2

Because more than 50% of the world's oxygen is produced by the Amazon Forest that is why it is called Lungs of the Planet