DNA ligase a. all of the choices b. joins together fragments of DNA c. initiates DNA replication d. replaces mispaired bases e. forms new DNA polymers

i think the miocene epoch spans the time from 23 million to 12 million years ago.

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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