Most asteroids

1. revolve around jupiter
2. are made of frozen gas and ice
3. are found between mars and jupiter
4. generate their own heat through nuclear fusion

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Explanation:

Asteroids do not revolve around Jupiter. Jupiter has its own moons and that is all that revolves around it that is easily visible.

Not all are made that way. In fact most are made out of rocks.

Three is correct. That's where they are.

Four is just absurd. If the earth can't do it, the other planets can't either.

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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