About how long ago did oxygen begin to accumulate in earth’s atmosphere?
a.2 million
b.20 mil...
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Chemistry, 16.04.2021 05:20 love123jones
About how long ago did oxygen begin to accumulate in earth’s atmosphere?
a.2 million
b.20 million
c.0.2 million
d.2 billion years
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Answers: 1
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