In the beginning animation you learn that there was a significant warming period about 10 million years after the dinosaurs went extinct. This warming can be seen
in the fossils of leaves from that period. In the activity we are determining how
many leaves are "toothed" rather than smooth. From the animation, what do they
say is the advantage to leaves being "toothed", what does it allow them to do?
You

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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