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| moved from place to place |
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| small family groups that lived and hunted together |
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| Any object made by people in the past |
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| scientists that study artifacts to learn how people lived long ago |
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| piles of trash that archaeologists dig through to learn about early people |
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| the exchanging, or buying and selling, of goods |
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| to trade one kind of good for another without using money |
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| a system such as a large trade system |
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| A Native American group that has the same leaders or culture |
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