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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. Agriculture
B. Cooperation
C. Education
D. Consumption

Sagot :

Answer: B. cooperation

Explanation:

essentially, cooperations are why we have vaccines, also just took the quiz

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