Gabe has noticed lately that his grandmother isn't as cheerful as she used to be. Even among family and friends, she tends to look sad. Her once epic appetite is gone too; she just tends to pick at her plate. Which of the following neurotransmitters may be causing these changes in Gabe's grandmother?

Mark and Cindy have been dating for 2 years. From the time they met until the present we would expect the Johari window in this relationship would remain the same

a. True b. False

Bettina Pollock and colleagues (2000) found that magpies

a. go from primary to tertiary circular reactions, bypassing secondary circular reactions. b. hide food, but do not possess object permanence. c. develop object permanence before hiding food. d. use deferred imitation.