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Discussion :: Environmental Science

  1. The source of atmospheric oxygen is

    2. A.

     Nitrogen cycle
    B.

     Green Plants
    C.

     Water
    D.

     Carbon Cycle

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    Answer : Option B

    Explanation :

    The main source of atmospheric free oxygen is photosynthesis, which produces sugars and free oxygen from carbon dioxide and water. Hence, answer B is correct.

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