The Aztecs were famous for developing which agricultural achievement? Astronomy • a complex Irrigation system that made inhospitable land able to cultivate plant life

• the slash-and-burn technique that allowed ash to create rich soll for next year's crops

• a series of plows that would first cut through the soil then turn up the earth

• the idea of crop rotation so that soils did not become over-used and unfertile

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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the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.

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