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Oxygen was initially created in earth's atmosphere by ____. ●Volcanoes outgassing ●cyanobacteria photosynthesizing ●greenhouse effect ●Ozone breaking down
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Oxygen was initially created in earth's atmosphere by ____.

●Volcanoes outgassing
●cyanobacteria photosynthesizing
●greenhouse effect
●Ozone breaking down

User Paul Hodgson
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Cyanobacteria is the source of oxygen.
User Erik Fubel
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it would be cyanobacteria photosynthesizing because photosynthesis in plants is what makes and releases oxygen
User Suv
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