HUMAN NUTRITION

Detailed explanation-1: -Four elements, hydrogen, carbon, oxygen and nitrogen, are the major components of most organic compounds.

Detailed explanation-2: -Organic molecules must contain carbon atoms covalently bonded to hydrogen atoms (C-H bonds). They usually involve oxygen and can also contain nitrogen, sulfur, phosphorous, and others. Hydrocarbons, like alkanes, alkenes and alkynes are all organic molecules and so are alcohols, carboxylic acids and carbohydrates.

Detailed explanation-3: -This means that all organic compounds have in common the presence of carbon atoms and hydrogen atoms. In addition, different organic compounds may contain oxygen, nitrogen, phosphorous, and other elements.