We can be sure that ancient civilizations knew of and were concerned about infectious diseases from several facts. The hunter gatherers rarely suffered from water borne diseases. They knew that the water that stank or did not taste well was not good to intake. Their main knowledge came from experience. During the Greek period several doctors like Alcmaeon of Croton were mentioned and hence they must have had the knowledge about infectious diseases like Cholera. Several other infectious disease treatment have also been mentioned during the Greek period.
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Answer:
The Yellow River Valley also known as the Huang He
Facing severe financial crisis, Louis XVI appointed three ministers who tried progressive reforms but failed under the pressure of opposition from the privileged classes of the society.
he powers of Congress are enumerated in several places in the Constitution. ... The last paragraph of Article I, Section 8 grants to Congress the power "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers"--the "Necessary and Proper Clause."
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