The macromolecules in biochemistry are proteins, carbohydrates, lipids and nucleic acids. what main elements do all of have in common?

Carbon
Oxygen
Hydrogen

A macromolecule is a large molecule. There are four groups of macromolecules: carbohydrates, proteins, nucleic acids and lipids. Lipids consist of glycerol and fatty acids and are constructed from fats, oils, waxes, phospholipids and steroids. A lipid's function is to insulate the body and provide warmth in cold conditions. It can be concluded that a person with very little body fat gets very cold easily and a person with a lot of body fat gets very warm very quickly.

Biochemistry, it deals with the chemical constitution, the breakdown and the synthesis of plant and animal products.