Multiple choice

How much of the world's oxygen is supplied by the Amazon rain forest?

  1. 10%

  2. 15%

  3. 20%

  4. 25%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

While often cited as the 'lungs of the planet', the Amazon rainforest is estimated to contribute about 20 percent of the world's oxygen production through photosynthesis.

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