Which charaterrisitics are always present in all living organisms

1) respond to their environment

2) grow and change

3) reproduce and have offspring

4) have a complex chemistry

5) maintain homeostasis

6) are built of structures called cells

7) pass their traits onto their offspring

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 think the answer is b.

hope it