How does energy acquisition in the deep sea differ from energy acquisition near the ocean’s surface?

a.
organisms in the deep sea acquire energy directly from the sun.
b.
organisms near the ocean’s surface rely on chemosynthesis rather than photosynthesis.
c.
organisms in the deep sea do not have direct access to sunlight.
d.
organisms in the deep sea have no means to obtain energy unless they travel to the ocean’s surface.

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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