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

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:

User Gilko
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