Biology, 14.07.2019 18:30, nails4life324

In the 1950s the polio virus paralyzed many children for life. today polio has been reduced by 99 percent. which of the following has played the greatest role in reducing polio infections worldwide? a. education b. cooperation c. agriculture d. consumption

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In the 1950s the polio virus paralyzed many children for life. today polio has been reduced by 99 pe...