#MolecularClock analysis shows #bacteria used oxygen long before widespread photosynthesis
https://phys.org/news/2025-04-molecular-clock-analysis-bacteria-oxygen.html
A geological timescale for bacterial #evolution and oxygen adaptation https://www.science.org/doi/10.1126/science.ADP1853
"the earliest aerobic transition occurred in an ancestor of photosynthetic #cyanobacteria, indicating that the ability to utilize trace amounts of oxygen may have allowed the development of genes central to oxygenic #photosynthesis."