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A. Oxygen 65%
B. Calcium 75%
C. Hydrogen 10%
D. Carbon 18%

Submitted by: Syed Nizakat Ali Shah

Oxygen is the most common element in the human body, comprising approximately 65.0% of body mass. Most of the oxygen present is found in the form of water.

Correct Answer: Oxygen 65%

Last Updated: March 08, 2022