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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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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