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The smallpox epidemic, Edward Jenner, and cowpox were all instrumental in the development of the first _____.
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The smallpox epidemic, Edward Jenner, and cowpox were all instrumental in the development of the first _____.

User Seyeon
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Answer:ITS B

Step-by-step explanation:

User Arleitiss
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vaccine also pastur created pencilin

User Jiggysoo
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