The difference between hunger and appetite is that hunger

 Hi,
Hunger is the physical need for food whereas appetite is the desire for food. Hunger occurs with low levels of glucose in your blood, several hours after eating.

Appetite is the conditioned response to food - it is a sensory reaction to the look or smell of food.

Letter d i believe letter d

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.