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The human body contains all the elements that exist on Earth. Many of these elements serve no purpose, but we absorb them from food, water and the air we breathe. This is why the average adult body contains significant amounts of aluminium, barium and lead. Even elements like silver, gold and uranium can be found in our bodies in minute amounts.
But of all the elements, only six make up 99 percent of the body’s mass. Complete the body puzzle to find out what these six elements are and why we need them.