Human body composition.

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There are 92  naturally occurring elements out of that 24 element are essential for biological activities.
The main elements that compose  human body are given below.


Elements       symbol.           Percentage %
Oxygen.           O.                      65
Carbon.            C.                       18 
Hydrogen.        H.                      9.5
Nitrogen.           N.                      3.2
Calcium.            Ca.                   1.5
Phosphorus.       P.                     1
Pottasium.           K.                    0.4
Sulphur.               S.                     0.3
Sodium.                Na.                   0.2
Chlorine.               Cl.                   0.2
Magnesium.       Mg.                    0.2




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