Final answer:
Protein, Lipid, Carbohydrate
Step-by-step explanation:
A) Protein: Proteins are macromolecules made up of amino acids that perform various functions in living organisms, such as providing structure, regulating processes, and facilitating chemical reactions.
B) Lipid: Lipids are a group of molecules that include fats, oils, and waxes. They serve as a source of energy, insulation, and protection for cells.
C) Carbohydrate: Carbohydrates are molecules composed of carbon, hydrogen, and oxygen atoms. They are a major source of energy for organisms and play a role in cell structure.