Answer :
D. universal recognition of facial expressions and the observation of blind persons' facial expressions.
Expressions refer to the outward display of emotions, thoughts, or feelings through various means, such as facial expressions, body language, gestures, or verbal communication. They serve as a form of nonverbal communication, allowing individuals to convey their inner states to others. Expressions can be subtle or explicit, conveying a wide range of emotions such as happiness, sadness, anger, surprise, fear, or disgust. They play a crucial role in interpersonal interactions, as they provide cues for understanding and interpreting the emotional and mental states of others. Understanding and interpreting expressions are essential for effective communication and building social connections.
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