Why do macromolecules need to be broken down by the body

It is is by digestion of complex molecules into simpler forms lke carbohydrates into its corresponding monosacchrides Glucose.Proteins to amino acids, Lipids to fatty acids and nuclec acids to nuclotides respectively.it is nothing but the metabolism of the complex macromolecules that we consume in the form of food.

carbon

explanation:

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds