glucose is a product of photosynthesis. where do the carbon atoms of glucose produced during photosynthesis come from?

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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answer: 45

explanationyou have to add as well to be it could be

1. is geographic distribution

2 is increasing complexity

3 is transitional forms