Question

select the correct answer.
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.

Explanation:

A positive feedback loop amplifies a change. Option A: Sweating cools the body (negative feedback, restores balance). Option B: Thermostat regulates (negative feedback, maintains set point). Option C: Blood clots stop bleeding (negative feedback, restores normal). Option D: Hotter oceans release more \( \text{CO}_2 \), which increases temperature further—this amplifies the initial change (hotter oceans), so it's a positive feedback loop.

Answer:

D. As oceans get hotter, they release more \( \text{CO}_2 \), which then increases atmospheric and ocean temperatures.