Which of the following best describes how embryological evidence supports the idea that life changes over time?

A. some fossils exhibit similar structures, possibly due to a common ancestor

B. some animals exhibit similar stages in embryonic development

C. some animals exhibit structures that are no longer used for any purpose

D. some animals exhibit similar biological proteins

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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