They have different states and so does the U.S.
When the moist humid air moves into an area the barometer will show a decrease in its reading. Barometers are responsible for detecting the air pressure within the area. A humid air is a type of air that has low pressure and is usually found in low lying areas, therefore the reading in the barometer will fall down instead of go up.
A) An increasingly industrial society affected the population distribution of the United States.
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The correct answer is definitely D.
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