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The two elements that make up the most common compound in the human body are oxygen (O) at 65% and carbon (C) at 18%. I hope this helped!! Have a great day!! :)
Almost 99% of the mass of the human body is made up of six elements: OXYGEN,CARBON,hydrogen,NITROGEN,calcium, and phosphorus. Only about 0.85% is composed of another 5 elements: potassium, sulfur, sodium, chlorine, and magnesium. Really hoped this helped.