I think by your last comment Curious, you don't quite understand the concept of evolution. It sounds like you are using the word evolve, synonymous with appear. That is not the case.

I will give you a modern day example.

The common cold. Every year a new immunization for the common cold is made. We have to do this because the bacteria in cold virus have the ability to adapt themselves to changing environments. It doesn't do this on purpose, it has no consciousness of it's own. It happens because the cells that make up bacteria mutate, which is an accident that happens when cells divide sometimes. Billions upon billions of mutations occur within these bacteria, and every once in a while one of these mutations allows for them to exist in what was a previously hostile environment. The bacteria that did not mutate in an adaptive way quickly die out, however the ones that did are now able to survive and multiply. Thus a new strain of the common cold is formed.