The second law of thermodynamics states that not all of the energy is used because some of the energy is lost in the form of heat. The lost heat energy is an unusable form of energy, and it causes an increase in the entropy of the universe. Thus, no energy transfer process is efficient due to the loss of energy.
I chose the answer that said "Transition to socialist and communist government systems, and creation of labor unions."
The coronary arteries supply oxygen to The heart muscle
It would be a catalyst. They help increase the rate of chemical reactions.
