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    Earth Portrait of a Planet Study Set 2
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    Exam 13: A Biography of the Earth
  5. Question
    What Caused the Buildup of Oxygen in the Atmosphere at Roughly
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What Caused the Buildup of Oxygen in the Atmosphere at Roughly

Question 41

Question 41

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What caused the buildup of oxygen in the atmosphere at roughly 2.5 Ga?

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Photosynthetic organisms produ...

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