Which list shows organization of living things from the simplest to most complex? A organ system, organ, tissue, cell
B tissue, cell, organ, organ system
C organ, organ system, cell, tissue
D cell, tissue, organ, organ system

d

Explanation:

Because you need the cell to become tissue then the tissue Becomes organs then a bunch of organs become a organ system

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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amber has allowed scientists to study dna that has been preserved over millions of years.