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PERSONALITY
Personality is the way we act in some different circumstances, like when we have a problem with a friend, or how we react to an accident, etc. We all have different personalities, that's what make every human different from others. Personality can be developed by heredity, the genetic basis for it, like temperament and emotions, but it is mostly because of the things we learn in our lives: what we see, feel, etc.
For example, if a young boy lives with parents who fight constantly, brothers who drink alcohol and sisters on drugs, that child is obviously running to a very bad personality. But, let say, if the kid lives with parents who are optimist and happy, patient brothers who help him and charming sisters who takes him to the park, the boy is going to be a good, patient, and charming person.
Personality doesn't depends only on ourselves, but on the ones who surround us too, because before it is actually complete, it has to travel through a pad of construction and preparation in the environment.
"Personality development." Wikipedia. Wikimedia Foundation, 25 Apr. 2014. Web. 1 May 2014. <http://en.wikipedia.org/wiki/Personality_development>.