Final answer:
The answer is: a) Carbohydrate, b) Lipid, c) Protein, d) Nucleic acid.
Step-by-step explanation:
Proteins, carbohydrates, nucleic acids, and lipids are the four major classes of biological macromolecules. These macromolecules are large molecules necessary for life that are built from smaller organic molecules. Carbohydrates are a group of macromolecules that provide energy and structural support to cells. Lipids are a class of macromolecules that include fats and oils, and are important for energy storage and cell membrane structure. Proteins are macromolecules that have various functions in the body, such as enzymatic activity and structural support. Nucleic acids are macromolecules that store and transmit genetic information. Therefore, the answer to the question is: a) Carbohydrate, b) Lipid, c) Protein, d) Nucleic acid.