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ecoandevo:

Origin of Photosynthesis Revealed: Genome Analysis of ‘Living Fossil’ Sheds Light on the Evolution of Plants

ScienceDaily (Feb. 21, 2012) — Atmospheric oxygen really took off on our planet about 2.4 billion years ago during the Great Oxygenation Event. At this key juncture of our planet’s evolution, species had either to learn to cope with this poison that was produced by photosynthesizing cyanobacteria or they went extinct. It now seems strange to think that the gas that sustains much of modern life had such a distasteful beginning.

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