Answer:The Huang He was isolated from other places and people by its geography.
Explanation:
A
It explains that many people died because medicines and medical practices were not effective . your welcome !
The Federal Reserve System, the central bank of the United States, conducts the nation's monetary policy<span>, supervises and regulates banks, and provides a variety of financial services to the U.S. government and to the nation's banks. The Federal Reserve System is supervised by the Board of Governors.</span>
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