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Answer:nMining played an important role in the settling of the American West. Demand for minerals rose dramatically after the Civil War as the United States changed from a farming nation to an industrial nation. Mining also led to the building of railroads to connect the mines to factories back east.
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Answer: 1, 3, & 4
creating rest-resistant strains of vegetables
the use of tissue and organ transplants
the use of laser technologies to avoid open-heart surgery
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