How can wisdom teeth be evidence of evolution?

Fossils indicate that the first few generations who lived on earth had molars that were much larger in size. Evolution changed this pattern somewhere down the line and the first molars became the largest in the set. As we continue to evolve, studies indicate that future generations will have no wisdom teeth at all.

Explanation:

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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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