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Life before the rise of oxygen

The discovery of molecular fossils in 2.7-billion-year-old rocks prompted a re-evaluation of microbial evolution, and of the advent of photosynthesis and rise of atmospheric oxygen. That discovery now comes into question.

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Figure 1: The evolution of eukaryotes and cyanobacteria, and the rise of atmospheric oxygen.


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Fischer, W. Life before the rise of oxygen. Nature 455, 1051–1052 (2008).

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