Diagram 3 shows sedimentary rock layers at two locations, Site 1 and Site 2. Notice that layers A and C at Site 1 are the same as layers F and G at Site 2. But Layer B is missing at Site 2. What can you infer happened to Layer B to produce the unconformity between Layers F and G at Site 2?

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.  

read more on -

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it

not: both offer magnification to the atomic level.