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How should the change from early atmosphere to the present oxygen-rich atmosphere be understood?

Answer and explanation

Correct answer: A gradual result of geochemical and later biological processes

The early atmosphere had little free oxygen and it increased later. In exams, treat atmospheric evolution as gradual.

Related tags

OriginEvolutionAtmosphereEarly And Modern TheoriesThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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