anonymous
  • anonymous
Which gas was least abundant in Earth's early atmosphere prior to 2 billion years ago? -O2 -CO2 -CH4 -H20
Biology
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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UnkleRhaukus
  • UnkleRhaukus
\[O_2\]
anonymous
  • anonymous
I think it was oxygen - apparently there was no free oxygen in Earth's earliest atmosphere.

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