Which of the following is true of mammals’ slow-twitch muscle fibers? a. Because they are aerobic, they are subject to rapid fatigue. b. Because they are anaerobic, they are subject to rapid fatigue....

Which of the following is true of mammals’ slow-twitch muscle fibers? a. Because they are aerobic, they are subject to rapid fatigue. b. Because they are anaerobic, they are subject to rapid fatigue. c. Because they are aerobic, they do not fatigue rapidly. d. Because they are anaerobic, they do not fatigue rapidly.