Which statement is supported by the diagram?
A: Homo neanderthalensis is an ancestor of Homo sapiens.
B: Homo erectus is an ancestor of Homo sapiens.
C: Some ancestors can be on several branches in the hominids.
D: Some ancestors of Homo sapiens have not yet been identified.

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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