Which of the following is an example of positive feedback? A. sweating to cool down
B. blood sugar regulation by release of insulin
C. childbirth contractions from oxytocin
D. control of blood pressure by the vessels and hypothalmus

control of blood pressure by the vessels and hypothalmus

you can't see the options

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.