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  1. Greenhouse effect is caused by

    2. A.

     Nitrogen
    B.

     Carbon dioxide
    C.

     Carbon monoxide
    D.

     Nitrogen dioxide

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    Answer : Option B

    Explanation :

    Earth's greenhouse gases trap heat in the atmosphere and warm the planet. The main gases responsible for the greenhouse effect include carbon dioxide, methane, nitrous oxide, and water vapour (which all occur naturally), and fluorinated gases (which are synthetic).

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