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![]() Exeter, UK (SPX) Jun 12, 2014 Scientists investigating one of the greatest riddles of the Earth's past may have discovered a mechanism to help determine how oxygen levels in the atmosphere expanded to allow life to evolve. High concentrations of atmospheric oxygen have been essential for the evolution of complex life on the Earth. Over the 4.5 billion years of Earth history, oxygen concentration has risen from trace amounts to 21% of the atmosphere today. However, the mechanisms behind this rise are uncertain, and it remains o ... read more ![]() |
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