What Is Life? 2nd Edition by Jay Phelan

Exercise 38

Every time a source of energy is converted from one form to another:
A) the potential energy of the system increases.
B) heat is required.
C) The cyclist produces the most potential energy as she cruises down the hill's steep
D) the total amount of energy in the universe is reduced by a tiny amount.
E) some of the energy is converted to heat, which is not a very usable form of kinetic energy.