All foods that require refrigeration should be maintained at an internal temperature of 45

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)

1.controls blood flow2.controls oxygen flow3.carries oxygen rich blood to veins