In human body 99% of total mass is formed of_____________?
Correct answer: D. 6 Bio-elements
- A. 16 Bio-elements
- B. 12 Bio-elements
- C. 10 Bio-elements
- D. 6 Bio-elements
Explanation
About 99% of the human body's mass is contributed by six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. The other bio-elements are essential but occur in much smaller quantities. Students may choose 12 or 16 bio-elements by confusing the number of biologically important elements with the six that contribute nearly all body mass.
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