Answer: Smile
Explanation: According to the theory of Ekman, Smile is defined in the manner of acting as factor for communication for long distance . It indicates about the differentiating the zygomatic muscles and the orbicularis oculi muscle from each other.
This leads to the phenomena of occurring immediate happiness and enjoyment in the form of smile that is denoted by the name of Duchenne smile.This smile is considered to be smiling along with the eyes.
