Smiling When Happy Seems to Be an Expression Common to All

question 2

Multiple Choice

Smiling when happy seems to be an expression common to all human societies, suggesting that this behavior is probably:

• A)genetic in origin.
• B)learned.
• C)altruistic.
• D)based on social standing.

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Acronym for American Psychological Association, a major scientific and professional organization of psychologists in the United States, or referring to its publication style guide.

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