Preliminary, non-experimental, research that gathers information about behavior is called 
research.
The main mechanism that can cause loss of fluid in the body would be from sweating and from urinating. Pathological causes that might cause loss of body fluid like diarrhea and bleeding.
Drugs that induce sweating is called diaphoresis. Drugs that induce urine production called diuretic.
If the question is ask for the name of condition where the body loses fluid it can be dehydrated or shock(more severe than dehydrated).
Yes because you have sudden or weakness of facevarm or leg mostly in the side of the body
In case of head injury keep the person still
true
