Withdraw from heavy barbiturate or alcohol use after a very long period of use has a high risk of death.
a. true
b. false

That is A. because drinking can kill you

Yes you do , which is cool

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)