Is greensulfur bacteria the first living organism that had been found ...
Yes, green sulfur bacteria (via their FMO complex) are widely recognized as the source of the first direct experimental evidence of long-lived electronic quantum coherence in a photosynthetic biological system, though later work refined the interpretation and extended findings to other organisms; claims of entanglement came afterward and are more theoretical or model-based.
In 2007, Engel, Fleming, and colleagues used two-dimensional electronic spectroscopy on the Fenna–Matthews–Olson (FMO) bact...
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