6. When traveling at higher speeds (40 mph or faster), the most fuel efficient way to keep the car cool is to:
A. roll down all the windows.
B. use the air conditioner.
C. alternate between the air conditioner and the open window.
O D. roll down the rear windows only.

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.

Answerbasal cell carcinoma;

Answeras soon as the cord has stopped pulsating;