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Who developed the first effective vaccine against polio? A. Jonas Salk B. Norman Borlaug C. Vladimir Zworykin D. Marshall McLuhan
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Who developed the first effective vaccine against polio?

A. Jonas Salk


B. Norman Borlaug


C. Vladimir Zworykin


D. Marshall McLuhan

User Pernille
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2 Answers

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I believe the answer is, A, Jonas Salk. I hope this helps!
User BitBank
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4 votes
Your answer is A. Jonas Salk
User Filmjamr Movies
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