By how much do the ossicles amplify sound?

What is one feature of autism that leads scientists to think that it is genetically based?

a. Fathers with autism consistently have sons with autism. b. Both abnormal brain development and abnormally large brains are found in children with autism. c. Scientists have found a gene that is present in all autistic children. d. Blood tests can show the presence of autism.

Nonshared environmental variance refers to the aspects of the environment that

A) children raised in the same home experience differently. B) children raised in different homes experience as similar. C) children raised in the same home experience identically. D) are shared in different communities and cultures. E) vary over time for an individual.