On ella's fifth birthday, her parents told her she had to stop whining or no one would want to play with her. she tried very hard to not whine. after a while, she decided that she didn't have anything to whine about. this is an example of: a. a token economy. b. learned optimism. c. learned . d. subjective being.

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?

Is the portion of the electromagnetic spectrum that has a frequency just above that of visible light.