Inevitability of Evolution

Sometime recently I realized that evolution is intrinsic in the fabric of life as we know it. Any system that includes self-reproducing entities that can mutate from generation to generation, and also has limited resources necessary for the survival of the various kinds of entities, will spontaneously give rise to an evolutionary process. The scarceness of resources means that if a kind of entity has a member that reproduces in such a way that its offspring reproduce faster or use resources more efficiently or are better able to maintain control over the resources than the original kind of entity are, then the newly mutated kind of entity will grow in population, using up more of the limited resources, eventually leaving no resources for the earlier entity, and so will displace it.

Clearly the mechanics of evolution--mutation rates, genetic structure, anatomy and/or physiology of the entities--are unimportant to the existence of evolution. The only necessary elements are reproduction with occasional mutation and limited resources. Obviously, this does not address the issue of whether some being created everything or when, it simply demonstrates that in our current world, evolution is inevitable because of systematic structure of the biosphere. I will leave arguments in favor of and opposed to evolution as the source of advanced life forms on Earth as an exercise for the reader. ;^)