Which statement describes an example of a positive feedback loop?


A. Warm-blooded animals sweat when they get too hot. Sweating is a method by which the body cools itself.

B. A thermostat regulates temperature by turning a furnace or air conditioner on and off.

C. When blood flows from a mild cut, blood clots form to prevent excessive bleeding.

D. As oceans become warmer they release more CO2, which then increases atmospheric and ocean temperatures.