What inference can be made from the phylogenetic tree? Choose 1
Species A was probably much larger than any of the other organisms.
B
Species G is extinct.
С
Species F and G are more closely related than species B and E.
Species C is the most recent common ancestor of species B and D.

1

Explanation:

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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i don't know. if i were you, i would search it up online : d