20. Which metal is present in the human body in greater percentage ?

(A) Calcium (B) Sodium (C) Potassium (D) Iron

Hi,

 

Calcium is the most abundant mineral in the body; the bones and teeth accounting for about 99% of the total body stores. Sodium, potassium and iron are present in the blood.

Hence the correct answer is option A.

 

Hope it helps.

Cheers!