Rare 2.5-billion-year-old rocks reveal hot spot of sulfur-breathing bacteria
College Park MD (SPX) Nov 07, 2014 - Wriggle your toes in a marsh's mucky bottom sediment and you'll probably inhale a rotten egg smell, the distinctive odor of hydrogen sulfide gas. That's the biochemical signature of sulfur-using bacteria, one of Earth's most ancient and widespread life forms. Among scientists who study the early history of our 4.5 billion-year-old planet, there is a vigorous debate about the evolution of s ... more
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