Will give branliest what can we do to improve the lives of the aged in north america?

Well, one thing that we could try to do in this sort of case would be perhaps by supporting there food ways of eating. We could provide them great nutritious foods, and by this, they could sty healthy, and not only that, but also, they could stay more alive by us giving them food that would keep their body very active and going.

C) all of the above hope this

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)