Answer:
I'm pretty sure the answer is 4.
Explanation:
1 and 2 are definitely homeostasis because it is a way to keep your body balanced how it needs to be and 3 would be a natural reaction that your body would make to prevent further pain, but 4 would be a personal choice that is made by the person who stays up.
A, turning on gene expression
I would say that the nurse would have to intervene if the client say chose Campbell's soup as part of her diet as it is known to have high amounts of salt or crackers with salt on them or say savoury foods like stuffed olives.
