Based on the Scientific Evidence Presented in Chapter 19 of Biology

Multiple Choice

Based on the scientific evidence presented in Chapter 19 of Biology Now,which of the following is NOT the reason for the observed increase in incidence of autism in the United States and other countries since the 1970s?

A) There is a heightened awareness of autism in society.
B) More schools are screening more students for autism.
C) People are generally more willing to label a broader range of conditions within the spectrum of autism disorders.
D) The MMR vaccine is being more broadly administered,so more children are getting autism.