What makes us a person, an individual, is not just our d and a if it were, then identical twins would be effectively the same person. Even from the moment they're born, the brains of identical twins are already clearly different from each other. The family environment doesn't seem to affect these traits very much. People who are adopted share no extra resemblance with their adoptive siblings than they do with anybody else on the planet. Basically, mean really says parental upbringing there is not having much of an effect.

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