Marcy decides that yelling at her pre-teen son to clean is room is not effective. Instead, whenever he cleans his room without being asked, Marcy takes him to his favorite ice cream shop. In this example, the ice cream is the .

In this example, the ice cream is the REWARD for Positive REINFORCEMENT.

Explanation: In Psychology, reinforcement can be defined as the process whereby a behavior with desirable consequences comes to be repeated. Reinforcement is applied to promote or encourage a behavior in the future.

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.