The _____ theory of personality suggests that differences in sociability are caused by differences in the amount of blood an individual has present in his or her body compared to other substances.

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The bodily fluid theory suggests that differences in sociability are caused by differences in the amount of bodily fluids present in an individual's body, particularly blood, bile, and phlegm. This theory has its roots in ancient Greek medicine and was popularized by Hippocrates and Galen.

The _____ Theory of Personality Suggests That Differences in Sociability