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  1. The percentage of oxygen in air is approximately

  2. A.

     100%

    B.

     1%

    C.

     78%

    D.

     21%

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    Answer : Option D

    Explanation :

    It's a mixture of different gases. The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.


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