Oxygen accounts for __________ percent of totals human body mass?
Correct answer: A. 65%
- A. 65%
- B. 18%
- C. 10%
- D. 3%
Explanation
Oxygen is the most abundant element in the human body by mass, contributing about 65%, largely because it is present in body water and organic molecules. Students may choose 18% because carbon contributes roughly that proportion of body mass, but the question asks for oxygen.
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