Anyone who disputes evolution clearly has no idea what evolution is. Perhaps they can investigate why we have two bones in our forearm, which evolved from the first creatures that crawled out of the water. Basically every land creature has two bones where their forearm is. Then they can investigate why our DNA carries throughout all of those same creatures, from mice to whales. At that point they can start investigating why your DNA is part of your parents. I can go on and on (LITERALLY) on assorted aspects of evolution that seem to 'prove' it is fact, yet because of the nature of evolution itself, it is very hard to test. A theory then, since you can't easily test it alone, and the components of it are so widespread.
The most basic evolutionary experiment would be to force humans to have headbutt contests to see who can reproduce. After about three generations of this, we would see people with bigger and more powerful heads. Go for a million years, and we would have horns or something wacky like that. This is basically what evolution is about, a feature that allowed a species to survive is passed on and can improve with successive generations.
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