Carbon is very important element to biology . what are some of the reasons that organisms need nitrogen

Nitrogen is esential for amino acids

Explanation:

Nitrogen, present in the atomosphere in a diatomic way (N2), is essential just like Carbon, to form amino acids (remember that they are composed of Carbon, Hydrogen, Oxygen and Nitrogen). The amino acids are the precursors of the peptides, which will then form proteins eg albumin.

that is wrong, its not thymus.