The planet Uranus is tilted nearly on its side, so that its axis of rotation is only 8 degrees away from its orbital plane. If you lived at latittue 45 degrees of Uranians, for what fraction of a Uranian year would the longest winter night last?

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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oxygen +1 most likely

b. to discover aspects of the natural world.

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