Marlene is very angry at Dominique, a girl in her class, because she feels that Dominique has been flirting with her boyfriend. To get back at her, Marlene starts spreading rumors about Dominique that are designed to attack her character. Marlene is using ____ aggression to hurt her classmate

The most common cause of Down syndrome is an extra 21st chromosome ________

a. in the sperm cell b. in a parent older than 35 c. in a father over 35 d. in the ovum

Who is credited with founding child development as an academic discipline and used questionnaires to study the "contents of children's minds?"

a. John Watson b. G. Stanley Hall c. Jean Piaget d. John Locke