Cheryl loves to brag about her accomplishments. She enjoys being the center of attention, is self-absorbed, and lacks empathy. She is exhibiting characteristics of which personality disorder?

Which of the following statements about Jerome Kagan's research on the development of shyness and sociability is true?

A) The majority of babies in the study were overwhelmed by novelty. B) About 50 to 70 percent of the groups retained their temperamental styles as they grew older. C) Most children's dispositions became more extreme over time. D) Most children's dispositions became less extreme over time.

Genetic causes are at the root of ____ of cases of autism

a) 10% b) 20% c) 35% d) 50%