What is the primary reason the body needs nutrients?

There are 6 essential nutrients that the body needs to function properly. Nutrients are compounds in foods essential to life and health, providing us with energy, the building blocks for repair and growth and substances necessary to regulate chemical processesMARK ME AS BRAINLIST

The lungs are the bags that hold air as it is inhaled oxygen gas that is in the air moved into the blood-and the heart pumps to move this oxygenated blood to cells in the body that need energy

That's  a project for you to do. btw your teacher probably uses a plagiarism detector and if you do copy anything on this site she/ he will find out and instead of getting a good  or bad grade you'll  get a 0 no exceptions, and they'll  probably call ur parents. so do some research ask friends and fam to you.