Target heart rate is the answer because target heart rate is to be maintained during exercise to ensure the best cardiovascular function
Nutrients are made to heal and help build and repair tissue. Nutrients have a lot of main uses but I think it’s A. Hope this helps.
When you don’t get enough sleep after a while I would say about 2-3 days you will start hallucinating/ seeing things that are not really there. Then your brain will start to fall asleep while your body is still awake and moving, this can lead to death.
