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What does the lack of free oxygen in Earth's early atmosphere indicate?

Answer and explanation

Correct answer: Widespread photosynthetic life had not developed then

Free oxygen in the atmosphere increased later due to biological activity. In exams, keep early and present atmospheres separate.

Related tags

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

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