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    Question

    The percentage (%) of Carbon in the atmosphere, by

    volume, is:
    A 0.03 Correct Answer Incorrect Answer
    B 3 Correct Answer Incorrect Answer
    C 13 Correct Answer Incorrect Answer
    D 21 Correct Answer Incorrect Answer

    Solution

    Atmospheric CO₂ constitutes ~0.04% (412 ppm), closest to option (a). 

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