Enzymes are special types of that speed up chemical reactions.

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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because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle

the answer you are looking for is the united states forest service.

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