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Single Microbe May Have Triggered the "Great Dying" 171

An anonymous reader writes with an excerpt from Medical Daily about a new theory for what triggered the "Great Dying: " "Researchers believe that they may finally know why the event occurred, but the theory is not without controversy. There are several theories, including the possibility of a meteorite hitting the planet. Previously, most researchers believed that the Permian mass extinction was a result of a series of volcanic eruptions in what is now Siberia. ... However, Daniel Rothman from the Massachusetts Institute of Technology is floating around a different theory. As he presented in a meeting for the American Geophysical Union, he believes that the mass extinction could have been caused by something much smaller. His theory is that the extinction was caused by a single strain of bacteria."
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Single Microbe May Have Triggered the "Great Dying"

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Be careful when a loop exits to the same place from side and bottom.