Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?

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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answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

b) the inside picture would look at a very high temperature in a very low ph