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Which process is most responsible for the increase in early Earths atmospheric oxygen levels
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Which process is most responsible for the increase in early Earths atmospheric oxygen levels

User Johan Lindskogen
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Photosynthesis is the correct answer.

User Maeda
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The Great Oxygenation Event- referred to as such because it increased Earth's atmospheric oxygen levels. This was caused by the evolution of photosynthesizing organisms releasing oxygen.
User Sabumnim
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