What are the determining factors that bring changes in population?

True or false? the usa has one of the safest food supplies in the world

A72-year-old woman fell in her bathtub and fractured her hip. in viewing the fracture, x-ray revealed osteoporotic changes in her bone as well. after reduction of the fracture, and immobilizing the bones with internal pins, what type of exercise would the doctor have advised her to do as soon as she was able in addition to prescribing calcium supplements to improve her bone mass?

The frequency in wich you perform certain exercise depends on the blank of the exercise