Geography, 23.11.2019 05:31 ROBIOX3551

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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