Free oxygen was a common constituent of the Earth's early atmosphere.

Name: Free oxygen was a common constituent of the Earth's early atmosphere.
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Free oxygen was not a common constituent of the Earth's early atmosphere. The atmosphere was primarily made up of nitrogen, methane, carbon dioxide, and water vapor. It was only after the evolution of oxygen-producing photosynthesis that free oxygen began to accumulate in the atmosphere.

Free Oxygen Was a Common Constituent of the Earth's Early