Biology, 24.01.2020 18:31 jnthnsngh

What evidence is there that oxygen levels in the sea increased due to photosynthetic bacteria?

(1): global cooling
(2): rust deposits in today’s ocean
(3): rust deposits in the ancient ocean
(4): decreases in anaerobic organisms

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What evidence is there that oxygen levels in the sea increased due to photosynthetic bacteria?

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