Deep water rises along the coast of peru to replace surface water carried away from the coast by strong winds. why is upwelling important?

It delivers nutrients to the well-lit epipalegic zone, stimulating photosynthesis.

Upwelling is a an oceanographic phenomena, in which high speed wind currents replaces warmer, nutrient depleted surface water with dense, cool, nutrient rich water from the bottom of the ocean. This process increases the nutrient content of the surface water or epipelegic zone. The epipelegic zone is the surface layer of the ocean. This zone receives the maximum sunlight. Upwelling process favors high biological activity in this zone because of the availability of nutrients and sunlight favor photosynthesis, responsible for the growth of large number of phytoplanktons.  

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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