HELP PLEASE 50 POINTS What is the correct definition of a 'calorie'?

1)a substance the body needs to function
2)a guide for making healthful daily food choices
3)a unit of heat that measures the energy available in foods
4)a process of taking in food and using it for energy, growth, and good health

During his workout yesterday, anthony pushed himself by lifting heavier weights. today he is feeling good, but his muscles are sore. what principle is at work in this situation? a. specificity b. progression c. overload d. reversibility

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

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?