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What is the primary reason why life expectancy increased during the twentieth century?
Wiki User
∙ 12y ago
all of these
sanitation, nutrition, and medicine
The primary reason is clean drinking water. This can be considered part of public sanitation. Clean drinking water and universal public sanitation are responsible for about 80% of all increased life expectancy during the 20th century.
Wiki User
∙ 12y ago
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