Which of these is an example of a positive feedback mechanism? a) An increase in blood pressure activates mechanisms tha

[answerhappygod]

Which of these is an example of a positive feedbackmechanism?
a) An increase in blood pressure activates mechanisms thatdecrease blood pressure.
b) Increased amounts of a hormone in the blood cause a decreasein the secretion of that hormone.
c) Increased carbon dioxide in the blood increases breathingrate, which decreases carbon dioxide in the blood.
d) Increased amounts of fluid in the blood result in increasedquantities of urine, which decreases fluid content of theblood.
e) Increased stretch of the uterus causes it to contract, whichfurther increases stretch.