Most of my college science classes were in Physics and Chemistry, but I took a course on Genetics and learned about DNA, inheritance, etc. Although the course didn't focus much on evolution, I was struck by the observation that the existence of DNA proves how evolution works: if there is a chemical change in one's DNA, then the sperm or egg will cause a mutation. Some mutations (like those that weaken childhood immunity) are bad for an organism, others (like an eye color change) are neither good nor bad, and the ones that strengthen the individual will be more likely to increase survival.
-- Richard
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