Why does fluid come out of our eyes when we get “sad” or upset? How could a genetic characteristic like that develop?

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Why does fluid come out of our eyes when we get “sad” or upset? How could a genetic characteristic like that develop?

In: Biology

It signals to the social unit around the individual that there is a crises, motivating the social unit to care for the individual.

Check out when babies learn to fake crying to get their parents to do stuff.

Yet, studies have shown that sadness tears contain different hormons and stuff than tears of joy or similar. So, we do “need” our tears to get rid of the stuff that makes us sad.