The average duration of a fixation is about __________ milliseconds

__________ is a state of tension resulting from the deprivation of physical needs, such as those for food and water

a) Motivation b) A drive c) Homeostasis d) An instinct

Nine-year-old Desi is in the _____ stage of cognitive development whereas her 15-year-old brother is likely in the _____ stage

a) preoperational; concrete operations b) sensorimotor; preoperational c) formal operations; sensorimotor d) concrete operations; formal operations