good morning
here is another suggestion, N.Drew, and this takes on board your ring theory by suggesting that success and error is the spark that powers evolution. And for a demonstration of evolution I suggest HIV. Its parasitic nature and abilitiy to mutate are key to its success but this comes with mutative errors that threaten its own existence. The mutations that happen within the virus are examples of evolution. the virus does not die of its errors becuse it mutates very very fast. the beneficial mutations that escape the body's defences outweigh the erroneous ones that would kill the virus itself.
Mutations usually happen very slowly -for examples in our own genes we have error correcting mechanisms in all of our cells which go into action when the blueprint is replicated. If we did not have these mecahisms you would see us mutating,evolving, living and dying at the same time - ring wipple.
Howsat