Evolution

1. Mutation occurs
2. This mutation is most likely harmful (, thus reducing the chance of reproduction therefore halting the propagation of the gene
3. If the mutation is beneficial to survival or encourages more reproduction, (ie more nerves in the vagoo) then the gene will be propogated
4. give this process millions of years and..

>>3

This is true, but many of these neutral mutations (ie blue hair) would be viewed as strange by a culture and therefore they would not reproduce