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Which gas became part of Earths atmosphere mainly as a result of the evolution of life forms?
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Which gas became part of Earths atmosphere mainly as a result of the evolution of life forms?

User Dan Jenson
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The answer is oxygen!
User Alxndr
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That would be oxygen. Oxygen is generated mostly by plants, so as a result of evolution, it became part of the atmosphere.
User MuraliMohan
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