When a situation and a trait are examined in the same study, there are _________ systematic sources of influence on behavior

It is important for parents to have a good idea of when their children should reach

certain developmental milestones. About when does a child's language explode so rapidly that one writer called it the "all hell breaks loose" stage? (a) 6 months (b) 12 months (c) 18 months (d) about two and a half

According to Stephahnie Coontz, which of the following is the cause of current increases in social problems?

a. The disintegration of the "traditional" family. b. Economic factors. c. The decrease in the marriage rate. d. The increase in poor parenting.