I was in class today and my teacher (who has a masters in Biology) started talking about genes, which then turned to mutations of genes.
As we all know, mutation plays an enormous part in the Evolutionary theory. The problem is, 99% of mutation is bad and generally deadly. An example would be cancer. So what are the chances, that even with billions of years, we have mutated this far from a single-celled organism, and that there are literally billions of different species of bugs and animals? How does that happen?