Lipinsky332 Lipinsky332
  • 21-04-2015
  • English
Answered

The Salk vaccine has proved to be a(n) ___ protection against the crippling disease of polio. A. artless B. excrescence C. efficacious D. crescendo



Answer :

Chippey00 Chippey00
  • 21-04-2015
i think the answer is C

Hope it helps
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