[JoshGray]

A poor example as Autism can be driven by environmental factors such as the MMR immunization drugs.

can.

Extreme levels of stress can create an initial condition of psycho-somatic asthma in children. Additionally, it's now known that cockroaches present in the home can cause children to develop asthma.

can can

What the twin studies show is that there are environmental as well as genetic factors in these conditions.

If they were entirely genetic, we'd see a much higher concordance between identical twins, approaching 100%. If it were entirely environmental, we'd see a concordance rate in identical twins closer to the rate between non-identical twins.

[Maelstrom]

SO set up a situation that's non-falsifiable and claim victory.

Environmental factors are the primary reason for homosexual behavior. Some claim that it's a nutritional *deficiency* in the womb, others, like myself, claim that it's a mental disorder brought about by a combination of factors including but not limited to: low self-esteem, a need to "belong", poor relationships within the family, and an addictive personality.