QUOTE: "Cyanobacteria are planetary-scale engineers, capable of splitting water. They invented the most challenging chemistry on the face of the planet. We would love to be able to do their water-splitting chemistry as effortlessly as they do to make fuels, and these guys figured out how to do it two and a half billion years ago," Fischer says."

David's comment: One might assume that this mutation, as a one-of, was a direct intervention by God to create the oxygen-rich atmosphere we have today.

Alternatively one might assume, as Fischer does, that these guys figured out how to do it.