Sammi plans to have the pump in her model circulate clear water through the plastic tubes. Then, she will flush green- colored water through the corrugated cardboard tube. The arrows in the image show the direction that the water will
flow through both the plastic and cardboard tubes.

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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i think that the best answer would be c.

tell me if im wrong : )

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).