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Scientists infer that oxygen in Earth’s atmosphere
did not exist in large quantities until after
(1) the first multicellular, soft-bodied marine
organisms appeared on Earth
(2) the initial opening of the Atlantic Ocean
(3) the first sexually reproducing organisms
appeared on Earth
(4) photosynthetic cyanobacteria evolved in
Earth’s oceans

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Glauxeira
Photosynthesis is the process of converting carbon dioxide into oxygen. Oxygen didn't really exist in the atmosphere until photosynthetic organisms appeared and evolved.

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