Discovery of an approximately 1.8 billion-year-old deep-water marine sulfur-cycling microbial community that shares morphological, habitat, and physiological similarities with a previously discovered 2.3 billion-year-old community and with a modern-day community suggests that the deep seafloor environment has likely remained largely unchanged for at least 2.3 billion years, resulting in evolutionary stasis for the sulfur-cycling microbial communities inhabiting the deep seafloor, according to a study.
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