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What is the correct expert-level reason for low free oxygen in the early atmosphere?

Answer and explanation

Correct answer: Because widespread oxygen-producing photosynthetic life had not yet developed

Free oxygen increased through later biological development. In exams, do not treat the early atmosphere as the same as the present atmosphere.

Related tags

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

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