History, 05.10.2020 21:01 chanel2013
Read the passage about Dr. John Snow. In 1849, doctor John Snow began to question the long-held beliefs that disease was caused by “bad air.” When a cholera epidemic broke out in London, he interviewed residents of the hardest-hit areas. He mapped cases of the disease and determined that they were centered around a particular water pump. To test his theory that contaminated water was to blame, he convinced local leaders to disable the pump by removing the pump handle. The outbreak came to an end. What was Dr. Snow’s hypothesis? Cholera was caused by “bad air.” Cases were centered around a water pump. Contaminated water caused cholera. Leaders should disable the water pump.
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History, 21.06.2019 22:30
What did president johnson risk violating the tenure of office act to the fire of his secretary of war
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The military dictatorship inviolently reacted to the opposition of the maya, who demanded greater rights for their native population. the genocide inresulted from a struggle between arab nomadic tribes and non-arab agricultural groups. the tutsi were the victims of genocide inat the hands of the hutu rulers.
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History, 22.06.2019 03:00
Aheard of sheep moves up in the mountain to graze during summer and migrated to the valley during winter what type of migration do the sheep follow
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Read the passage about Dr. John Snow. In 1849, doctor John Snow began to question the long-held beli...
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