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Algebra 13 Online
OpenStudy (anonymous):

Research was done to study the facial expressions of people, since facial expression clearly shows the emotional state of a person. Researchers found that people who smiled a lot lived longer than those who didn't smile much. Which statement can be inferred from the passage? Smiling prolongs human life. Smiling is associated with human longevity. Smiling decreases a person's life span. There is no link between smiling and human longevity.

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