An advantage of parallel circuits is that a. it is the simplest type of circuit to make. b. electrons can only take one path, so the flow of energy is always known. c. if one part of the circuit is not working, the other parts can still work. d. when one part of the circuit breaks, the whole circuit must be replaced.

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.