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History, 30.01.2020 10:49 alexiasvizcaino

Based on the information in "edward jenner and the history of smallpox and vaccination,” which sentence best explains how the twentieth century is significant in the historical timeline of smallpox?

it represents an improvement of the vaccination.
it represents a decrease in disease mortality.
it represents a need for revaccination.
it represents the end of the disease.

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Based on the information in "edward jenner and the history of smallpox and vaccination,” which sente...
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