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    Question

    Which gas is most abundant in the Earth’s atmosphere

    by volume?
    A Carbon dioxide Correct Answer Incorrect Answer
    B Oxygen Correct Answer Incorrect Answer
    C Argon Correct Answer Incorrect Answer
    D Nitrogen Correct Answer Incorrect Answer

    Solution

    Nitrogen dominates the atmosphere with about 78 % by volume. Its presence helps dilute oxygen and other gases. Nitrogen becomes available to plants and then to animals, making it vital for forming proteins and nucleic acids in living organisms. 

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