A student conducts an investigation measuring the rate of water loss in milliliters for three plants. Plant 1 is exposed to high humidity, Plant 2 to high temperature, and
Plant 3 to room temperature. Measurements are taken at half-hour intervals for three
hours. In planning this investigation, what additional element is needed to ensure that
it has an effective control?
ed to high temperature

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.  

read more on -

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.