Situation: Imagine that you have a small room full of air. There is no way for air to move in or out of the room, so it is a closed system. You have measured the temperature of the air and have found it to be 75o F with 80% relative humidity. If the amount of water vapor that was contained in the air at that time does not change, but the temperature is decreased, would the relative humidity in the
room increase or decrease and why?

a.   mass number from atomic number

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

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 you are looking for is d. there are no holes for blood to enter or leave the system. your welcome