The key to depth perception is ____, the ability to combine the images of each eye into one image

In 2007, almost ________ percent of births in the United States were to unmarried women

a. 10 b. 20 c. 40 d. 60

Your text has a section on infant directed speech (IDS). Which of the following is the best summary?

a. IDS uses habituation to help infants with morpheme perception and morpheme segregation b. mothers tend to be better at IDS than fathers and this contributes to infants' "mommy preference" c. IDS uses emotional tone and pitch patterns and helps aid language development d. efforts to teach IDS to single mothers in low income communities have succeeded in helping children develop better categorization skills