The cyanobacteria are the first group of bacteria that evolved that could fix atmospheric carbon dioxide into organic carbon compounds using water as an electron donor and thereby evolving oxygen. We owe the present oxygen-rich environment partially to the millions of years of photosynthetic activity by Cyanaobacteria that made it possible for other life forms that are oxygen dependent to evolve. Indeed it is this same ability to fix carbon dioxide and produce organic matter that we are presently utilizing in the mass cultivation of these organisms for food.
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