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What was the main reason free oxygen was low in Earth's early atmosphere?

Answer and explanation

Correct answer: Photosynthetic life had not yet widely developed

The early atmosphere came from volcanic gases and life later increased oxygen. Exam tip: connect oxygen rise with biological activity.

Related tags

Early AtmosphereOxygenEarth EvolutionStar 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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