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  1. The longest era of the classification of the history of earth is

    2. A.

     Cainozoic era
    B.

     Pre-Cambrian era
    C.

     Palaeozoic era
    D.

     Mesozoic era

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    Answer : Option B

    Explanation :

    Pre-Cambrian era is the longest era of the classification of the history of earth.

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