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over billions of years through natural selection. we still don't understand it all, but (in a BROAD overview) mutations in the genetic code eventually took us from being a once celled organism (probably at the bottom of the ocean) to being a human. if you need an in depth answer, i would suggest googling for a reliable source, because the complete theory and supporting evidence would be far too long to type here. -Akilae

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15y ago

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