What kind of research investigation is conducted in a controlled setting explicitly designed to hold events constant?

Catherine's dog of 14 years recently died. For a week she cried, reflected on the time she shared with her dog and began adjusting to her life without Lucky. This experience is typical of sadness, not depression

a. True b. False

The main focus of developmental psychology is the study of ____.?

a. ?whether nature or nurture causes behavior b. ?how people change across the lifespan c. ?the psychosocial stages of development d. ?the maturation of children