You don't need billions of years. There was a docu on TV a little while ago, and they had a tray split into sections, and they put a particular kind of bacterium into a weak solution of anti-biotics in the first section, and most of the bugs died but then some didn't and the ones that survived had evolved resistance and thrived and took over that section, and they repeated that experiment a couple of times with stronger anti-biotics with the same result each time. That's evolution before your eyes. You do know that new flu viruses arrive every year, right? That we have AIDS which came from animals? That there is a new variety of TB which has evolved to become drug-resistant? All due to evolution, buddy.