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  1. In the earliest days when life originated on earth, the atmospheric obtained
    1. Free oxygen
    2. No oxygen
    3. Oxygen in fixed form
    4. Oxygen bound to carbon
Correct Option: D

NA


Comments


  1. SANTOSH KUMAR

    June 21, 2018 Reply

    Early atmosphere contained a massive amount of carbon dioxide and carbon monoxide due to volcanic eruptions and meteorites colliding with earth's surface. Thus, oxygen was bound to carbon during the earliest days of origin of life on earth.


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