Maria's cheerful "Good morning!" elicits a smile from her mother, which raises Maria's spirits further and leads her to make a joke. This is an example of

Dr. Garcia is a sleep researcher who supports the theory that the purpose of sleep is to consolidate memories and rest the vision system. The name of the theory Dr. Garcia supports is the _____ theory.

A) inactivity B) brain plasticity C) energy conservation D) evolutionary

Four-year-old Jasmine is shown two identical tall glasses of water and agrees that they contain the same amount of liquid. When the liquid from one glass is poured into a short, wide container, she says there is more water in the shorter container

because it is “all spread out.” Jasmine lacksan understanding of ________. A) conservation B) centration C) dual representation D) reversibility