What elements are needed to carry out photosynthesis? Select all that apply.

water,solar energy,carbon dioxide

Explanation:

You need carbon dioxide, sunlight, and water.

Explanation:

Hope this helps, although you did not provide options. :) <3

i think that the best answer would be c.

tell me if im wrong : )

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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