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  1. The most abundant constituent of atmospheric air is :

    2. A.

     Carbon
    B.

     Hydrogen
    C.

     Oxygen
    D.

     Nitrogen

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    Answer : Option D

    Explanation :

    Air is the name given to the atmosphere used in breathing and photosynthesis. Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases.

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