Even something as complex as the eye has appeared several times; for example, in the squid, the vertebrates, and the arthropods. It's bad enough accounting for the origin of such things once, but the thought of producing them several times according to the modern synthetic theory makes my head swim
Many Canadian nationalists harbour the bizarre fear that should we ever reject royalty, we would instantly mutate into Americans, as though the Canadian sense of self is so frail and delicate a bud, that the only thing stopping it from being swallowed whole by the US is an English lady in a funny hat.