Molecular clock analysis shows bacteria used oxygen long before widespread photosynthesis

PHYSorg
Apr 3, 2025, 2:00 pm143 pts
Microbial organisms dominate life on Earth, but tracing their early history and evolution is difficult because they rarely fossilize. Determining when exactly a particular group of microbes first appeared is especially hard. However, ancient sediments and rocks hold chemical clues of available nutrients that…

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