A very important rule to follow when working with experimental subjects is (blank) . a) do no harm
b) don't forget to tape record everything
c) get there early
d) use animals instead of humans whenever possible

(a)do no harm cause when using people gor experiments you are to care for them not distroy them

it would be a lot of diff ones. hope this ! < 3 : )

the maintenance of fluid balance during exercise. author information: fluid supplementation is necessary for exercise in which fluid losses must be offset by intake to avoid the negative effects of hypohydration on health and performance.