Which of the following is an example of a limiting factor? A. A prolonged drought
B. Heavy rainfall
C. A small pond

A prolonged drought.

I think it is A, a prolonged drought because you have limit to water, so that is the limited factor. Hope this helps!

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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a chair, a bed, and a toothbrush

explanation: