At what stage have children acquired the ability to pass conservation tasks?

Forgetting can result from each of the following EXCEPT ______

a. biological factors such as head injuries b. excessively high levels of acetylcholine c. a lack of attention to critical cues d. failure to rehearse the material enough

Dr. Murphy examines 1-year-old Rosa while she is in her mother's arms. What did Harlow's

research show that would cause Dr. Murphy to encourage this rather than placing Rosa on an examining table? a. Infants always prefer their mothers over strangers. b. Infants of this age experience separation anxiety if not in physical proximity of their caregivers. c. Infants derive great comfort from physical contact with their parents and may experience less stress as a result. d. Parents can help hold infants so that it is easier to examine them.