As a person gets dehydrated, their blood becomes thicker and harder to pump. As this happens, the kidneys stop producing urine and the water from urine is redirected for use in the:
A. blood positive
B. negatve feeback

Negative Feedback

Explanation: The thickening of your blood also affects one of your other very vital organs: your brain. As this thick blood struggles to move throughout your body, it causes your blood pressure to rise, resulting in negative feedback.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.