Discribe the structure of paramecium

they are single celled protist, most commonly found in aquatic habitats.Certain paramecia are also easily cultured in labs and serve as useful model organisms.they are usually oblong or round.

Explanation:

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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tissue

explanation:

it is actually formed by geoup of cells which is tissue