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the human body with exception of the brain and the bones, is completely replaced by itself (all it's cells completely replace themselves on the order of 5-6 times a year.) the atoms that make up your body and that yhou are eatinga nd drinking and inhaling and rubbing into yr skin are the same atoms that have been rolling around on the earth for over 5 billion years and before that were inside of a star for several billion years.
you inhale dust (most;ly dead human skin cells) that contains atoms that were parts of those you come in contact with.
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