From ages 6 to 12 years, how many primary teeth do children lose?

Part of Chapter 6 examined students' study strategies for easy and difficult material. Which of the following students provides the most accurate perspective on that research?

a. Carlo: "When the memory task is relatively easy, students spend about the same amount of time studying the easiest items and the most difficult items." b. Sondra: "When the memory task is relatively easy, students spend the most time on the difficult items; when the memory task is relatively difficult, students spend the most time on the easy items." c. Phil: "Students study the difficult items more than the easy items when the material is related to their own interests; otherwise, they show no consistent pattern in their study strategies." d. Indira: "Students' study strategies depend on their motivational level; the most motivated students divide their time equally among the topics, but the less motivated students spend more time on the difficult tasks."

Of the following questions, which most accurately reflects the study of personality?

a) How do humans differ from animals? b) Who am I? c) How have humans changed over the course of history? d) When are behavior patterns determined?