When sound moves through a medium, it makes the particles of the medium squash together and spread out in other places creating a wave known as

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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the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.