But if we look on other parts of our bodies where we don't directly interact with the environment -- our kidneys, our livers, our hearts -- there is no way to say, by just looking at these organs, where in the world they would come from.
Però si mirem en altres parts del cos les quals no interactuem directament amb l'entorn - Ronyons, fetges, cors - no hi ha manera de dir només mirant aquests òrgans, de quin lloc del món vénen.