How does the current, or sixth, mass extinction differ from the past five mass extinction events?
A.
The sixth mass extinction is believed to be caused by human-related factors.
B.
The sixth mass extinction is believed to be caused by natural forces.
C.
The sixth mass extinction is believed to affect relatively fewer species.
D.
The sixth mass e

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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