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

Answers: 2

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Scientists infer that oxygen in earth’s atmosphere
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