Nitrogen, carbon, water and hydrogen make up more than what percentage of the mass of the human body?

Answer 1

http://web2.airmail.net/uthman/elements_of_body.html
I checked at the above site and it shows a 70 kg person having

43 kg oxygen
16 kg carbon
7 kg hydrogen
1.8 kg nitrogen
total C,O, H, N = 67.8 kg and
(67.8/70]*100 =96.9%
You may want to check my figures and my calculation.