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La composicion del cuerpo humano puede considerarse desde el punto de vista de la composicion de masa o atomica. Para ilustrar ambos puntos de vista, el cuerpo humano es 70 por ciento agua, y el agua es un 11 por ciento hidrogeno por masa pero un 67 por ciento hidrogeno por porcentaje atomico. Por lo tanto, la mayor parte de la masa de un cuerpo humano es oxigeno, pero la mayoria de los atomos en el cuerpo humano son...