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| First period of prehistoric human culture; approximately 2 million years ago to 3,000 B.C. |
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| the first period of the stone age, called the old stone age, from about 2 mya to around 8,000 B.C.E. |
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| the later part of the stone age, from about 8,000 to 3,000 B.C.E. |
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Definition
| to train a wild animal to be useful to humans. |
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Definition
| the bussiness of farming. |
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Definition
| the bussiness of buying and selling or exchanging items. |
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Definition
| a mineral mined for its valuable uses. |
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