05-05-2017
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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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Аноним Аноним

05-05-2017

Your answer is A. Jonas Salk

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MLPFangirl MLPFangirl

05-05-2017

I believe the answer is, A, Jonas Salk. I hope this helps!

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