| http://www.w3.org/ns/prov#value | - Journal From what I have read (which was a LONG time ago so further discoveries and theories may have developed), Earth had little or no oxygen when life developed, and the oxygen would have been a poisonous byproduct, like methane is to today's life.So life itself would have changed the environment, of course along with other such variables as volcanos, continental drifting, and meteors.
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