The Incas practiced medicine. Inca medicine was performed by (16). Before surgery, they (17) the area to be operated on. They also gave patients a drug to put them to (18) during the operation. The Incas used leaves from the coca plant as a powerful (19).

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Explanation:

several states had passed similar laws, but they were limited to intrastate businesses. the sherman antitrust act was based on the constitutional power of congress to regulate interstate commerce.

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