Dwayne purchased a Sony TV ten years ago. Now he wants to purchase a new wide-screen TV, and when he goes to the store, he looks at the Sony TVs first. What principle might account for his behavior?

David and Daniel are twins who are genetically identical and are known as ___________ twins. Annabelle and Timothy are also twins, but they are obviously ___________ twins

a. monozygotic; identical c. monozygotic; dizygotic b. dizygotic; fraternal d. dizygotic; monozygotic

Evidence from the National Institute of Child Health and Development (NICHD) Study of Early Child Care—the largest longitudinal study to date, including more than 1,300 infants and their families—reveals that

A) nonparental child care by itself does not affect attachment quality. B) full-time, but not part-time, work during the first year is detrimental to attachment security. C) exposure to child care exerts a more powerful impact on children's adjustment than parenting quality. D) having more than one child-care arrangement decreases the likelihood of attachment insecurity.