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Why was free oxygen low in Earth's atmosphere before photosynthesis?

Answer and explanation

Correct answer: Biological processes producing and accumulating oxygen were not widespread

Free oxygen rose later through photosynthetic organisms. Exam tip: connect oxygen rise with life evolution.

Related tags

Early AtmosphereOxygenPhotosynthesisStar FormationFormation Of PlanetsAnd Our Solar SystemStar Formation Formation Of Planets And Our Solar SystemThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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