Which is the first period in which Piaget would expect children to understand that changing the shape of a ball of clay from a pancake shape to a ball does not change the amount of clay there is?

Sex reassignment surgery is used to treat some cases of

a. paraphila. b. dissociative disorder. c. homosexuality and bisexuality. d. transsexuality and intersexuality.

A first hand story reflecting the meaning experienced by the teller is called a

a. survey b. participant-observer study c. narrative case study d. naturalistic observation study