Largest layer of earth that makes up most of the earths mass. A:crust B:mantle. C:outer core. B:inner core

Mantle is the answer

Explanation:

The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the mantle is the thickest layer, while the crust is the thinnest layer.

I am taking the same class rn!!! whos your teacher??

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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human didn't come from monkeys man i hate these stupid teachers