How are carbon, hydrogen, and oxygen used to make new molecules? What type of molecules are made?

Carbon, hydrogen, and oxygen is used to make new molecules by bonding to each other, often via covalent bonds in which electrons are shared. The four major macromolecules - - lipids, proteins, carbs, and nucleic acids all have carbon, hydrogen, and oxygen; in other words, these elements are the basis for many long and essential molecules.