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2 July, 15:38

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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Answers (1)
  1. 2 July, 18:19
    0
    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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