Which form of birth control is 100 percent effective at preventing pregnancy? a. male condom b. female condom c. birth control pills d. none of the above

It would be D. because nothing can be 100% you can still get pregnant from all of those things. 
 hope i helped! :) 

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)

Wash your hands often and recycle your trash instead of just throwing it away.