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History/Health

Questions (2)

Which of the following explains the impact of the creation of the smallpox vaccine on the Americas?(1 point)Responses It led to
1. 3 answers
2. asked by benito
3. 30 views
POLIO BEFORE AND AFTER THE VACCINE3. What trend does the graph show? What explains the trend? between the year 1950 to 1963
1. 1 answer
2. asked by hallo
3. 28 views