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 sen...
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