The number of naturally accusing chemical elements involved in bio chemical reaction is

A. 126 
B. 86 
C. 92 
D. 206

There are 92 naturally occurring elements, each differing from the others in the number of protons and electrons in its atoms. Living organisms, however, are made of only a small selection of these elements, four of which—carbon (C), hydrogen (H), nitrogen (N), and oxygen (O)—make up 96.5% of an organism's weight.

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