Answer :
After a national census has been taken, changes in population distribution cause the changing of congressional seats among the states. this effect is commonly called reapportionment.
Population density is a measure of population per unit area. Applies primarily to humans, but may also apply to other organisms. It's an important geographical term. Population density is simply the ratio of people to physical space, which is the number of people living in an area per square kilometer, or some other unit of land area. This shows the relationship between population and the size of the area in which it lives.
Population distribution is about how people are distributed around the world. When examining population distribution, you want to find out why some locations are more densely populated than others. Population Density:
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