Choose the option that best matches the description given.
a molecule that carries genetic information and can be passed on from a parent to a child
gene
receptor
nucleus

The answer id letter d 90 

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)