I dont understand what they are asking please help!!

"Phenotype" would mean the two letter combination of traits that make up this trait. For example, heterozygous would be something like "Cc", with the "C" representing a dominant trait and "b" representing a recessive trait.

In this case, the answer would look something like "CC", though I'm not sure the exact letters this question is using. Good luck!

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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