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Oxygen is about 65% of the human body by mass.

Oxygen is in many biological molecules, but most of it is in water.

Water by itself can be 65% of the mass of a human. (It varies with age, gender, muscle and and body fat, but is 55-65% for adults and more for children.)

Numerically, hydrogen atoms represent 65% of all atoms in the human body.

That varies too, because many of the hydrogen are abound up in water and water content varies.

As one can see, many things are 65% of the human body.

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