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The videos you included in your hub are particularly interesting with respect to the subjects of obesity in the U.S. and also about Downs Syndrome. Good job! Thanks!
Thanks for writing a hub on this subject.
I believe that you are correct in that both are important but often the environment has a huge impact beyond physical characteristics or inherited genetic traits.
I believe you are correct. We cannot do much about the genetic makeup of what we have inherited except to be aware of certain risk factors & deal with them as best we can by lifestyle. As to environment, as adults we can work to make changes.
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I have often thought it interesting the studies that have been done on identical twins separated at birth & reared apart...just how similar they are in the things that they choose to do & how they live.