MCQ
When we plant more and more trees
  • A
    More oxygen is used up to clean the air
  • More carbon dioxide is used up to clean the air
  • C
    More nitrogen is used up to clean the air
  • D
    More nitrogen is released

Answer

Correct option: B.
More carbon dioxide is used up to clean the air
(B) More carbon dioxide is used up to clean the air

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