Which three elements do all four biomolecules have in common

All 4 groups of biomolecules will contain Carbon. C: Carbon has 4 electrons in its outer shell H: Hydrogenhas 1 electron in its outer shell O: Oxygen N: Nitrogen P: Phosphorus S:Sulfur These elements combine in different ways to form the biomolecules. All 4 groups of biomolecules will contain Carbon.