Let's set the existence-of-God issue aside for a later volume, and just stipulate that in some way, self-replicating organisms came into existence on this planet and immediately began trying to get rid of each other, either by spamming their environments with rough copies of themselves, or by more direct means which hardly need to be belabored. Most of them failed, and their genetic legacy was erased from the universe forever, but a few found some way to survive and to propagate.
Neal StephensonOf persons I will say this: it is difficult to tell when they are running aright but easy to see when something has gone awry.
Neal StephensonConstable Moore had reached the age when men can subject their bodies to the worst irritations - whisky, cigars, woolen clothes, bagpipes - without feeling a thing or, at least, without letting on.
Neal Stephenson