Explanation:
a) This is a retrospective observational study.
b) This is an appropriate choice due to the rareness of MS.
c) The subjects were US military personnel, some of which had developed MS.
d) The variables were the vitamin D blood levels and whether or not the person developed MS.
I think the answer is A because to talk she probably already has to steady her breathing and help
Answer:
Normal drug use is meant by being prescribed by your doctor to make it legal to use, illegal drug use can get you arrested
Explanation:
your dumb.
