Question

which sentence describes an example of a positive feedback loop?

warm-blooded animals sweat when they get too hot. sweating is a method by which the body cools itself.

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

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

as oceans get hotter, they release more co₂, which then increases atmospheric and ocean temperatures

Explanation:

A positive feedback loop amplifies a change. Let's analyze each option:

• First option: Sweating cools the body (negative feedback, restores balance).
• Second option: Thermostat regulating temperature is negative feedback (maintains set point).
• Third option: Blood clots stop bleeding (negative feedback, stops a change).
• Fourth option: Warmer oceans release more CO₂, which makes them hotter (amplifies the initial warming, positive feedback).

Answer:

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