Advantages: Primary sources directly address your topic and often provide information that is unavailable elsewhere. For example, the questions you compose for an interview or a survey will likely target your unique interest in the topic. Similarly, to test a particular hypothesis, you can design your own experiment.
Disadvantages: Some primary sources, such as eyewitness accounts, may be too close to the subject, lacking a critical distance. Others, such as interviews, surveys, and experiments, are time consuming to prepare, administer, and analyze. Finally, unless you have been trained in accepted methodologies, your own primary research in certain fields of study may not be recognized as valid.
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D: both groups used gunpowder weapons to establish extensive empire's in the middle east
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5+5=10 you add the 5 and the other 5 and you get 10$ additionis great
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The Aztecs, the Maya, and the Inca.
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A couple examples of white collar jobs are corporate executives, advertising and public relation professionals, architects, stockbrokers, doctors, dentists and dietitians.
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