15 pts. will give brainliest if correct.
which of the following correctly describes where early earth's water came from?
the atmospheric water vapor condensed
collisions of comets released water
dust storms caused disturbances in the atmosphere, causing rain
atmospheric nitrogen converted into early water vapor which was later pressurized into liquid

atmospheric nitrogen converted into early water vapor which was later pressurized into liquid

atmospheric nitrogen converted into early water vapor which was later pressurized into liquid

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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explanation: