What is the primary justification of the hypothesis that the early Earth environment was void of oxygen

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What is the primary justification of the hypothesis that the early Earth environment was void of oxygen

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TUNDEXIGO TUNDEXIGO · Answer 1

The justification hypothesis that the early Earth environment was void of oxygen is:

atmosphere lacked oxygen but abundant in methane, ammonia, water vapour, noble gas, neon etc.

What did scientist proved about oxygen-less earth?

Studies revealed that the Earth's atmosphere was devoid of oxygen before more than 2.4 billion years ago.

However, some scientist proved that oxygen get brewing in the atmosphere from the oceans where a cyanobacterial photosynthesis occurred for about as 3 billion years ago.