Which sentence describes an example of a positive feedback loop? a: warm blooded animals were when they get too hot. sweating as a method by which the body close 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.

c

Explanation:

because the body uses itself to heal

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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it would lead to upper respiratory infections and pneumonia.