Before there was any life on earth, which gas was absent from earth’s ancient atmosphere? A. nitrogen B. ammonia C. oxygen D. methane

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Before there was any life on earth, OXYGEN was absent from earths ancient atmosphere.

mamarugz|Points 178|

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Asked 5/13/2014 9:16:30 PM

Updated 5/13/2014 9:45:01 PM

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Edited by jeifunk [5/13/2014 9:45:00 PM], Confirmed by jeifunk [5/13/2014 9:45:01 PM]

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Natural selection is the process developed by Darwin that causes organisms to develop traits that help them adapt to changes in their environment.

Added 5/14/2014 4:19:30 PM

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