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

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

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

asked
User Paul Hodgson
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2 Answers

3 votes
Cyanobacteria is the source of oxygen.
answered
User Erik Fubel
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8.5k points
0 votes
it would be cyanobacteria photosynthesizing because photosynthesis in plants is what makes and releases oxygen
answered
User Suv
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7.7k points
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