17. Epidemiology relies on non-experimental tests of hypotheses. What was Snow's hypothesis and how did he test it without performing experiments.

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pennsylvania pennsylvania colony was a proprietary colony founded when william penn was awarded a charter by king charles ii in 1681. he set up the colony as one of religious freedom. the government included a representative legislature with popularly elected officials. all taxpaying freemen could vote.

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i dont know but i need points