 Another challenge to the replicator/interactor approach to evolution by natural selection is to see replicators themselves as a product of natural selection rather than as a necessary starting point. One premise of this argument is that some form of natural selection must have occurred on entities that initially were not replicating, perhaps not even reproducing. This is recognized by Dawkins, who notes in passing in the second chapter of The Selfish Gene that “Darwin’s ‘survival of the fittest’ is really a special case of a more general law of survival of the stable” (Dawkins 1976: 13) and that life originated from selection of molecules for stability.