Which type of ecosystem or biome would likely have the highest net primary productivity?

The tropical rain forest biome or ecosystem has the highest net primary productivity.  It is considered as the highest net primary productivity for the fact that rainforests usually receives a rainfall of at least 80 inches or 200 cm rain per year.  It is also believed by the scientists that the rainforests consists of about half of the plants and animals that are found on the Earth’s land surface, or even lived near the rainforest areas.  Given also the fact that there is an abundant sunlight in rainforest aside from the abundant amount of rain, its warm temperatures, and a fast turnover of nutrients, these are the reason why tropical rainforests is named as the highest net primary productivity.

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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