DNA mutations alone cannot drive evolution. It is necessary that the environment exert some kind of natural selection pressure on the organism for evolution to occur. This is why "living fossils" do not evolve; they are in an environment with little to no selection pressure on them because they are so well adapted. As a result, the animals change very little over time, aside from a small amount of random genetic drift.
+
+
In addition, the statement that evolution has turned "worms into humans" is inaccurate. It would be more accurate to say that evolution has turned a small colony of bacteria in a pool of ooze into the entire majestic diversity of life on Earth. This is more impressive, as well.