How do we develop our personality or attitudes? biological or on our upbringing

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There is a continuous and unending debate regarding as to how we are able to develop our personality. Some argue that their are biological factors that affect our personality and thus no matter how we are brought up the personalities that we have are pre-determined by our biological make-up. On the other hand, others argue that our personality is actually determined by how we are brought up, that is the environmental or family setting that we are brought up with. While others state that it is a combination of these theories that make up ou personality and attitude. How about you guys? What do you think? Is our personality determined by our biological make-up; that is NATURE, or is it shaped by the way we were brought up; that is NURTURE, or then again is it a combination of these factors?