Which statement best defines fertilization?
O A. The period of about 40 weeks when a developing embryo or fetus
is in the uterus
O
B. A fertilized egg that has begun cell division
O
C. The joining of an egg and a sperm
O
D. The process by which the uterus contracts to push the fetus out of
the woman's body through the vagina

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)