If you increase the surface area of a rock, how will it affect the rate at which it weathers?
a.
it will weather more quickly.
b.
it will have no effect because surface area is not a factor in weathering.
c.
it will weather more slowly.
d.
it will have no effect because a rock does not have a surface area.

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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the answers are a and c