Population density is the number of people who live in a region divided by the number of
How do demographers figure out population growth?
One serious problem caused by a growing population is
The "push-pull" theory is used by scientists to explain
Large numbers of people have moved from rural areas to urban areas because they want to
Because commercial farms use modern technology, a small number of workers can
Countries with little industry are called
Capitalism is called a free-market economy because
Democracy, monarchy, and dictatorships are examples of
What does NATO stand for?
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