The answer is: "social epidemiology" .
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" <u> Social epidemiology </u> i<span>s the study of the causes and distribution of health, disease, and impairment throughout a population."
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Answer:
I am pretty sure that the correct answer is smallpox but I'm not too sure.
<span>= <span>101/4 </span></span><span>(Decimal: 25.25)</span>
