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  1. Evidence suggests that life on Earth has existed for about ________.

    2. A.

     3.5 million years
    B.

     35 billion years
    C.

     35 million years
    D.

     3.5 billion years

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    Answer : Option D

    Explanation :

    Evidence suggests that life on Earth has existed for about 3.5 billion years. The earliest known fossils on Earth date from 3.5 billion years ago and there is evidence that biological activity took place even earlier - just at the end of the period of late heavy bombardment.

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