No, they substitute foods so they don't kill a life
decline, ( depends on what you are talking about, i'm thinking more like women are getting less and less populated)
With good body posture you would be able to ski much more better than having bad body posture
Answer:
Both A and B, because if you have bad posture you will have weaker bones which can make you get hurt easier plus weaker bones will not be safe especially if you got in a car wreck.