Question Detail
Question
Which element is the most common in the human body by mass?
Correct Answer
Option D is the correct answer.
Detailed Explanation
Oxygen makes up about 65% of the human body by mass, primarily as a component of water and organic compounds. Carbon is about 18.5%, hydrogen 9.5%, and nitrogen 3.2%.
Hint
Think about the most abundant molecule in the body and its elemental composition.