Help Would Be Nice! The kingdom that has the most complex cell structure is the kingdom, due to .

animalia; its lack of a cell wall which enables its cells to diversify for different functions

fungi; its ability to absorb nutrients from its surroundings

plantae; its ability to make its own food directly from sunlight

protista; the diversity of cell types in this diverse kingdom

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

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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there's the proffessional site that will you.

trachea, alveoli, lung capillaries, arteries