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  1. What is the element that is in the highest percentage in the composition of the earth ?

    2. A.

     Silicon
    B.

     Oxygen
    C.

     Magnesium
    D.

     Iron

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    Answer : Option B

    Explanation :

    Oxygen has the highest percentage in both human body and on earth, but carbon, the element with the second highest percentage in the body, is relatively rare on Earth.

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