The letters in the diagram below represent index fossils
what is one possible explanation as to why index fossil t and the rock layer that it is associated with does not appear in rock layers #1?
a.) erosion occurred
b.) there is no explanation
c.) it was subducted and melted into magma
d.) too much sedimentation above the fossil crushed it

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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true is the answer : )