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Geography, 25.02.2021 14:00 jaylabazemore

14. When did cyanobacteria start producing pure oxygen? O A. After the Hadean eon
O B. During the Hadean eon
O C. After the Proterozoic eon
O D. During the Phanerozoic eon

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14. When did cyanobacteria start producing pure oxygen? O A. After the Hadean eon
O B. During...
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