The IQs of adopted children, for example, lose all resemblance to those of their adoptive family members and become more like the IQs of the biological parents they have never known.
While overseas adoption may be getting attention of late, the majority of adopted children in the United States are from the United States.
An international - Hague - convention on international adoption came into force 1years ago aimed at protecting the rights of adopted children and preventing child trafficking.
If the adopting families do not get prepared for all possible obstacles, they may fail to reach harmony with these adopted children.
It would be interesting to see the above graph reproduced for adopted children only.