What causes a nuclear fission chain reaction to continue?
a, the energy that results from the previous fission reaction
b. the neutrons that result from the previous fission reaction
c. thermal energy added to the system from the surroundings
d. thermal energy released from the system to the surroundings

A i hope i'm right

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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the answer is otpion c) understanding

he wants to be heard one more time. he wants to be understood. he needs the truth one more time.