One of the purposes of Darwin's book,The Expression of the Emotions in Man and Animals was to show:

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Darwin's main purpose in the book was to argue that many human and animal expressions of emotion had adaptive value in the evolutionary past, even if they no longer serve an obvious survival purpose in the present. This was in contrast to the prevailing belief at the time that human emotions were entirely cultural and socially constructed.

One of the Purposes of Darwin's Book,The Expression of the Emotions