<span>Oligarchy</span><span>
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. </span>
Answer:
After the accident, NASA reduced the amount of flammable Velcro in the crew cabin, and tested many of the capsule's materials for flammability. Now, as a result of the lessons learned from Apollo 1, many new materials have been developed for spaceflight with fire safety in mind.
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Answer:
. 1- The empires are gone 2- The wars over religion and territory have stopped 3- Population has skyrocketed-What was the Thirty Years War
