Answer:
Brett learned that his car is better protected from the weather when it has been recently washed and waxed. The macromolecule that protects his car is the lipid that is present in the wax coating.Step-by-step explanation:
The lipid is a macromolecule that is made up of carbon and hydrogen, and the macromolecule is hydrophobic in nature and does not come into contact with water. The wax is a lipid, so it does not like the water, and when the wax is applied to the car, the car is protected from water damage.
Hence, the macromolecule that protects his car is the lipid that is present in the wax coating.