Increasing the rate of an impulse is the function of the .

myelin sheath

Explanation:

Myelin sheath are the protective tissue that helps in protecting the nerve cells of the human body. It plays an important role in transmitting the information from brain to the body and vice-versa. Healthy myelin sheath helps in better and quick transmission of nerve signals. It is highly resistant towards electrical resistance.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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