When you see a child smiling,her smile communicates her feelings of happiness to you,and then you wave and smile back to her.Emotion in this regard serves as a(n):

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Emotions serve as social signals, allowing individuals to communicate their feelings to others and facilitating social interaction and coordination. In this scenario, the child's smile is a social signal of happiness, which you then reciprocate with a wave and smile.

When You See a Child Smiling,her Smile Communicates Her Feelings