When giving his speech, nick makes a point of having his facial expressions mirror what he is saying. for example, he smiles when saying something funny and keeps a solemn expression when talking about something that is sad. what function are nick's facial expressions serving?

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W0lf93
His facial expressions are emphasising his spoken statements thus enhancing their meaning. This ensures that the group that he is talking to understand his meaning and helps to alleviate the possibility of miscomprehension of his words. So the main function that his expressions are making would therefore be, that they are enhancing his communication to the group.