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The elemental composition of an adult human body by mass is

C > O > H > N
O >C >H > O
N > C > O > H
None

Correct Answer: O >C >H > O

Explanation:

O= 65%

C= 18%

H= 9.5%

N= 3.2%

Ca= 1.5%

Ph=1.2%

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