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.

If you could drill a hole straight to the center of the earth, and keep track of what the hole is going through, youwould find: a) you would go through one sort of material, and then a different, denser material, and then a still-different, still-denser material, because the planet is made of concentric layers, sort of like an onion.b) you would go through one sort of material all the way to the center, because the planet is all mixed up.c) if your hole started at the north pole, you would go through different layers of different materials, but ifyour hole started at the equator, you would go through one sort of material all the way to the center.d) if your hole started at the equator, you would go through different layers of different materials, but if yourhole started at the north pole, you would go through one sort of material all the way to the center.e) you would strike diet pepsi when you got to the center.