Why do humans have a ego?

My question is why is it that humans have a ego/self esteem/pride or whatever you want to call it. I think every human has an ego/pride that gives them a sense of self importance, esteem and makes them feel they are better than others. I want to know what is the scientific explanation to this? Was there some... show more My question is why is it that humans have a ego/self esteem/pride or whatever you want to call it. I think every human has an ego/pride that gives them a sense of self importance, esteem and makes them feel they are better than others.

I want to know what is the scientific explanation to this? Was there some evolutionary reason that humans have a ego? What is the objective truth? Thank you
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