In what percentage of children with autism do symptoms arise in toddlerhood rather than in infancy?
a. 30 percent
b. 50 percent
c. 75 percent
d. 100 percent
Question 2
Which statement about current views of the causes of autism is correct?
a. Autism is most likely caused by reactions to immunizations or early childhood infections.
b. Although many genes appear to be associated with autism, no clear causal relationship between a specific genetic abnormality and the occurrence of autism has been established.
c. Research indicates that the cause will be located in an area of the X chromosome.
d. Environmental factors, such as family configuration, are thought to be the primary cause.
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