Which one(s) of the essential chemical elements (H, C, O, N) does blood contain?

Question

All of them not just one of them.

All amino acids contain carbon, hydrogen, oxygen and nitrogen.

Blood contains several dozen proteins alone

http://www.agctr.lsu.edu/Subjects/eatsmart/protein2.htm

All of them not just one of them.

All amino acids contain carbon, hydrogen, oxygen and nitrogen.

Blood contains several dozen proteins alone

http://www.agctr.lsu.edu/Subjects/eatsmart/protein2.htm

Blood contains water (H2O), glucose (C6H12O6), and amino acids (C H O N)

Answer 1

its been 13 years and no one gave him an answer ;-;

Answer 2

thats so sad