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Nitrogen occurs in all organisms, primarily in amino acids (and thus proteins), in the nucleic acids (DNA and RNA) and in the energy transfer molecule adenosine triphosphate. The human body contains about 3% by mass of nitrogen, the fourth most abundant element in the body after oxygen, carbon, and hydrogen.
In summary, most carbon-containing compounds are organic, and almost all organic compounds contain at least a C-H bond or a C-C bond. A compound does not need to contain C-H bonds to be considered organic (e.g., urea), but many organic compounds do.ther compounds lacking C-H bonds that are also traditionally considered organic include benzenehexol, mesoxalic acid, and carbon tetrachloride. Mellitic acid, which contains no C-H bonds, is considered a possible organic substance in Martian soil.