Plankton key to origin of Earth's first breathable atmosphere

Monday, February 21, 2011 - 22:30 in Earth & Climate

Researchers studying the origin of Earth's first breathable atmosphere have zeroed in on the major role played by some very unassuming creatures: plankton. Scientists have now shown how plankton provided a critical link between the atmosphere and chemical isotopes stored in rocks 500 million years ago.

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