Carl has survived on the street because he has been able to adapt to the demands of street life. Carl is probably high in ____ intelligence

Which of the following substages marks the arrival of intentional, or goal-directed, behavior?

a. the use of reflexes b. the use of coordination of secondary circular reactions c. the use of secondary circular reactions d. the use of primary circular reactions

The term test heterogeneity BEST refers to the extent to which test items measure

A. the same factor. B. a unifactorial trait. C. different factors. D. a nonhomogeneous trait.