You know, we don't have to strictly limit this process to biological evolution. It's just simple cause and effect. Continents still drift, for example. Do people notice it? No, it's happening way too slowly, but it's changed the face of our planet over the course of the ages. Of course, if you didn't know that, you'd assume that god made the continents and placed them where they are today. THIS IS EVOLUTION! Cause and effect add up over the years, even very small, seemingly unimportant changes will have a drastic, broader reaching effect way down the line. It happens with the continents, it happens with our atmosphere, and it happens with plants and animals just the same. We are not exempt from the laws of physics, so why would we not change over time if our essential makeup is varied ever so slightly each time we reproduce?
And let's please try and keep this civil.