Evolutionary process can be considered as a rationing process. The scarce resources to be rationed are opportunities to survive. The criterion for discriminating among genes to determine which will get the chance to survive.

Competition is actually between genes.Animals are just tools genes use to compete with each other.

This statement ma make use feel desperate. As humans, we always want to be in control. It is hard for us to accept the fact that we are just tools.

Co-evolution of different genes.