First of all . .. every species has a limited range of change to work with. Secondly, a species will not make positive changes simply because it benefits them. There has to be a physical and chemical basis for the change to happen. Thirdly, the experiment mentioned NEVER GENERATED complete strands of working DNA. The more I study evolution . . . the more I realize that it is just as much a religion as Creationism. People believe in evolution because they WANT TO BELIEVE.