What are the two biggest energy issues currently faced by humans? rapid fuel use lack of energy resources pollution resulting from fuel use lack of energy conservation

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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well, you see. the answer to your question is quite simple. the thing that is big, powerful, and over 9,000 is your mom.

haploid cells;