Contemporary researchers have collected evidence that naturalist Charles Darwin (1872)was correct when he asserted that facial expressions are

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Facial expressions are species-specific, meaning that they are shared by all members of a particular species. This is in contrast to gender-specific, feeling-specific, culture-specific, and emotion-specific expressions, which are only found in certain groups of people.

Contemporary Researchers Have Collected Evidence That Naturalist Charles Darwin (1872)was