Scientists have argued the "nature-nurture" controversy for years and will probably continue to disagree on whether heredity or environment is more important; however, most experts agree that both the child's genetic heritage and the environment are critical factors to a child's personality and development.
There are some indications that INTELLIGENCE levels can be positively affected by adoption. There are also indications that both heredity and environment play a role in an adopted person's contracting cancer.
Find more information on environment
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©2000 by Christine Adamec and William Pierce, Ph.D. Reprinted from The Encyclopedia of Adoption, 2nd Edition (2nd Edition) with permission of Facts On File, Inc.