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So far as we currently understand, our DNA doesn't change from one thing to another. DNA however, can be simply explained as having "switches" that can turn it "on" or "off". In this way, some may explain DNA as having changed, however, it really doesn't change any more than a car changes when you turn the key. Mitochondrial DNA is so constant, it is used to tell where a person's ancient ancestors came from thousands of generations ago.

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10y ago

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