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radiation, temperature/climate changes and mutation. need i say more?
humans are always evolving. glitches in the dna code create various differences.. less visible now because there's more people now with different dna structures.. plus we dont marry our cousins anymore. but for example.. in the last few hundred years humans have grown almost a foot in height, and it is becoming more and more common that people are born without an appendix or wisdom teeth.
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