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What is the best reason for the lack of free oxygen in the early atmosphere?

Answer and explanation

Correct answer: Widespread photosynthetic life developed later

The early atmosphere did not have oxygen like today. In exams, connect free oxygen with a later biological stage.

Related tags

OriginEvolutionEarly AtmosphereOxygenEarly And Modern TheoriesThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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