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Tracking Down the First Oxygen Users 109

sciencehabit writes "None of us would be here today if, billions of years ago, a tiny, single-celled organism hadn't started using oxygen to make a living. Researchers don't know exactly when this happened, or why, but a team of scientists has come closer than ever before to finding out. They've identified the earliest known example of aerobic metabolism, the process of using oxygen as fuel. The discovery may even provide clues as to where the oxygen came from in the first place."
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Tracking Down the First Oxygen Users

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"Take that, you hostile sons-of-bitches!" -- James Coburn, in the finale of _The_President's_Analyst_