Which element is present in the largest amount (by mass) in the human body?
A) carbon
B) hydrogen
C) nitrogen
D) oxygen

Question

Quizplus · Accepted Answer

Oxygen is the most abundant element in the human body by mass, comprising about 65% of the total body mass. It is a key component of water and many biological molecules, such as carbohydrates, lipids, nucleic acids, and proteins. Carbon, hydrogen, and nitrogen are also important elements in the body, but they are present in smaller amounts compared to oxygen.

Which Element Is Present in the Largest Amount (By Mass)