brett learned that his car is better protected from the weather when it has been recently washed and waxed. which best describes the major group of macromolecules that is protecting his car and how it is performing this task?

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

c.           is the correct answer