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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Home » Geography » 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