Scientists have found large groups of fossils of marine organisms on mountaintops. What does this tell scientists about the past? 1. That these organisms left the ocean and climbed to the top of an inland mountain to die.
2. That these rocks were once below the surface of an ocean.
3. That these rocks were always above the surface of an ocean.

4.That these rocks must have been moved there by someone else.

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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c

explanation: