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In the conditions of earths early atmosphere, oxygen was limited and most of the atmosphere would be filled with noxious methane, carbon monoxide, hydrogen sulfide, and ammonia.

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Answer:

The primitive earth has  reducing atmosphere with little or no oxygen.

Explanation:

According to several theories, the early atmosphere of the earth was reducing in nature. It had little or no oxygen and was rich in carbon dioxide gas. The atmosphere of primitive earth had water in the form of water vapor. It also had gases like ammonia and methane. Oxygen was added to the atmosphere of earth by first oxygenic photosynthesizing organisms (cyanobacteria) later.

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