Evolutionary biology: Out of thin air


is renewed by sunlight falling on plants, algae and a particular class of bacterium called cyanobacteria — all of which produce molecular oxygen (O2) as a waste product of photosyn thesis (Box 1). Biologists agree that cyanobacteria invented the art of making oxygen, but when and how this came about remain uncertain. Oxygenic photosynthesis involves about… (More)
DOI: 10.1038/445610a

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