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If free oxygen had been abundant in early atmosphere which explanation would need change?

Answer and explanation

Correct answer: Explanation of later oxygen accumulation by photosynthesis

In reality free oxygen was low and increased later by photosynthesis. Exam tip: remember the difference between early and later atmosphere.

Related tags

Free OxygenPhotosynthesisEarly AtmosphereEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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