Which sentence 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 get hotter, they release more CO2, which then increases atmospheric and ocean temperatures.