life. Not all dysfunctional and abusive homes produce children with ADHD, and not all children with ADHD come from dysfunctional and abusive homes. However, there is some proof that it is linked to genetics. Children who have ADHD usually have at least one close relative who also has ADHD. And at least one-third of all fathers who had ADHD in their youth bear children who have ADHD. Even more proof that ADHD is linked to genetics is the fact that the majority of identical twins also bare the trait.
             Unlike many disorders, there is no clear physical characteristic
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