Pain does all of the following things except
a. indicate potential danger in environment
b. signal presence of injury in the body
c. alert body to presence of disease
d. warn the body about a natural disaster

Pain does all of the following things except D. warn the body about a natural disaster. You wouldn't normally feel pain if there was a forest fire nearby, or if there was a flood in a nearby city. This is why D is incorrect. Pain can indicate potential dangers - if you touch a burning stove, you will feel pain and understand that if you continue touching it, there will be severe consequences. Pain also signals injury, and alerts you that you may be experiencing a disease of some sort.

Probably because you wake up early. even when i get a good nights sleep i still feel tired if i wake up early. or maybe you just need coffee.