physiological basis of the phenomenon called "shifting of physiological zero

A sizable amount of the nitrogen and phosphorus that enters the Chesapeake Bay originates from farms and other faraway sources, yet it is people living near the bay, such as oystermen and crabbers, who bear many of the negative impacts. Who do you believe should be responsible for addressing the problems posed by nutrient pollution? Should policies on this issuebe developed and enforced by state governments, the federal government,both, or neither? Explain the reasons for your answer.

Regarding question "Which of the following is true of positive feedback?" the answers A. the change is opposite that of negative feedback and B. The change is amplified; how do these 2 answers differ from one another? Aren't they both true?

What part of the brain diagnoses speed?

What is the difference between range and threshold?