Pleasure, sadness, and anger are shown by similar facial expressions everywhere in the world. This is evidence that

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Quizplus · Accepted Answer

These expressions having a biological basis is supported by research showing that even in cultures that have had little to no contact with the rest of the world, people still express these emotions in similar ways. This suggests that such expressions are innate and not learned, pointing to a biological foundation rather than a cultural one.

Pleasure, Sadness, and Anger Are Shown by Similar Facial Expressions