Which element has the second most % in human body?

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

Submitted by: Syed Nizakat Ali Shah

Carbon 18% is the second most % element in human body. All living organisms contain carbon, which forms the basis for all of the organic molecules in the body. Carbon is the second most abundant element in the human body, accounting for 18% of body weight.

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