In comparison to the percent of two-parent families in the U.S. living in poverty today, the percent of single-parent families headed by a father living in poverty is:

As Dale is walking by Andy, he trips over Andy's foot, falls to the ground, and hits his face on the side of a table as he is falling. Dale will be most likely to reciprocate by acting violently toward Andy if

A) Dale knows that Andy grew up in abusive household. B) Andy intentionally tripped him. C) Andy's cat just died. D) Andy unintentionally tripped him. E) Andy is clumsy.

Children first begin to speak complex sentences such as, "The boy who cried had a boo-boo," by the age of about

a. one year. b. two years. c. three years. d. four years.