I can't figure out the answer

most likely B

Explanation:

B Paramecia

Explanation:

Paramecia are slipper-shaped and nearly see through, which poses for a difficult time when trying to see them in the beakers of cloudy water. Paramecia are covered in a protective pellicle that functions like skin and protects them from the elements. On the edges of the pellicle are the cilia, or tiny hair-like structures.

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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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explanation:

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