BIG open-ended question: how does the high (but not perfect) eukaryotic rate of correct DNA replication both ensure survival of species and confer the ability to generate new species (or, more likely, more competitive offspring)? In other words, mutation repair is an important part of survival. Without it, we would all likely succumb to one form of cancer or another. However, if mutation repair were absolutely perfect, there wouldn't be the opportunity for evolution, or of progression of species (toward improved genetic fitness). Explain how so much related to the field of genetics relies on this interesting dichotomy.