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Communication is one of the challenges for children with severe and multiple disabilities due to their impairments (Turnbull et al, 2004). There is about forty percent of unknown causes of severe and multiple disabilities, but prenatal biomedical is the majority known cause of the disabilities.
Causes. Autism spectrum disorder has no single known cause. Given the complexity of the disorder, and the fact that symptoms and severity vary, there are probably many causes. Both genetics and environment may play a role. 1  Genetic problems. 2  Several different genes appear to be involved in autism spectrum disorder.