To arrange something into groups according to similarities.

Taxonomy

Explanation:

Taxonomy is a word used mainly in biology to talk about classifying living organisms, organizing them according to their similarities. If you've ever seen a chart with animals divided into species, genus, and family, you know what scientific taxonomy is. Hope this helps!! :)

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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b.have there own function.