The theory of evolution by natural selection very elegantly describes the complex world of that which is living. It answers questions which physics is poorly equipped to answer, because trying to asks these questions within the framework of fundamental physical theories leads to hopelessly complicated answers.

This got me wondering: At what reductionist point does the theory of evolution by natural selection "stop working"? Is there a theory of evolution for cells? Viruses? Molecules? Atoms? The nature of reality and of the Universe itself? The selection pressure for living beings is anything that increases an organisms chances of survival and reproduction; can a selection pressure be formulated for subatomic particles or space or time or physical constants, or indeed, for the Universe itself?

full disclaimer
>I study mathematics and so my understanding of both physics and biology may be completely retarded