How did Earth come to have an oxygen atmosphere?
O
A. Oxygen was the primary gas origina...
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How did Earth come to have an oxygen atmosphere?
O
A. Oxygen was the primary gas originally in Earth's atmosphere.
O
B. Volcanoes released oxygen into the atmosphere.
O
C. Early organisms created oxygen from other gases in the
atmosphere.
O
D. Precambrian rocks released oxygen into the atmosphere.
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