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  1. Why is it difficult to breathe at higher altitudes?

    2. A.

     Due to low air pressure
    B.

     Due to low temperature
    C.

     Due to ozone
    D.

     Due to high humidity

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    Answer : Option A

    Explanation :

    At high altitudes, oxygen molecules are further apart because there is less pressure to "push" them together. This effectively means there are fewer oxygen molecules in the same volume of air as we inhale.

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