In community x (population 20,000), an epidemiologist conducted a prevalence survey in january of 2012 and reported an hiv prevalence of 2.2%. over the next 12 months, the department of health reported an additional 50 new hiv cases between february 2012 and january 2013. the total population stayed constant at 20,000.

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.

i think it's the first one because doctors aren't the ones who get rid of the old needles. most of them time it's not even doctors who give you shots, it's nurses.

this is true my friend.