IIyass
IIyass IIyass
  • 05-05-2017
  • History
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Who developed the first effective vaccine against polio?

A. Jonas Salk


B. Norman Borlaug


C. Vladimir Zworykin


D. Marshall McLuhan

Respuesta :

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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