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Early in the earth’s history there was little to no oxygen into atmosphere. How did oxygen levels in the atmosphere reach current levels?

Early in the earth’s history there was little to no oxygen into atmosphere. How did oxygen levels in the atmosphere reach current levels?
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Early in the earth’s history there was little to no oxygen into atmosphere. How did oxygen levels in the atmosphere reach current levels?

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User Taveced
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Answer: Cyanobacteria or blue-green algae became the first microbes to produce oxygen by photosynthesis

Step-by-step explanation:

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User Gilko
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