Ecotherms obtain hear from the ?

Ectotherms depend mainly on external heat sources, and their body temperature changes with the temperature of the environment.

Animals exchange heat with their environment through radiation, conduction—sometimes aided by convection—and evaporation.

Explanation:

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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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