Let this process continue over some thousands of generations, and your smooth mammoth gets replaced by a shaggy one. And let many different features affect your resistance to cold (for example, body size, amount of fat, and so on), and those features will change concurrently. The process is remarkably simple. It requires only that individuals of a species vary genetically in their ability to survive and reproduce in their environment. Given this, natural selection—and evolution—are inevitable.
SWITCH-A-ROO: Again, he uses a pretty good example of the wooly mammoth. A better example would like a cat or a dog. In fact, breeders "select" for good traits in cats and dogs and they end up coming up with a dog that doesn't shed for example. This is like natural selection (except fast tracked with intelligence - everything works better and faster with intelligence). But can they ever breed a dog into a horse? Of course not. And guess what. That wooly mamal with long hair now does not have the ability to have children with short hair because it has been bred out as an option - in order to specialize for the cold environment. So the ancestors had the ability to have short and long hair, but now the current wooly mammoth can only have long hair. Is that improvement? Is that macro-evolution? Nope. The new animal has less information than its ancestors. Also, have mutations occured? Nope. Just normal genetic variation from mom and dad designed by God to allow animals to survive in a fallen world.
