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The large amount of free oxygen in earth's present atmosphere is primarily a result of

The large amount of free oxygen in earth's present atmosphere is primarily a result of
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The large amount of free oxygen in earth's present atmosphere is primarily a result of

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User Cheriese
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a biological process such as photosynthesis. 13. Billions of years ago, Earth's atmosphere was composed primarily of carbon dioxide
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User NareshRavva
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