You heat up two substances, A and B. Both substances change color. When cooled, both substances return to their original colors. What most likely happened in this situation? A. A chemical change occurred in Substance A, and a physical change occurred in substance B. B. A physical change occurred in substance A, and a chemical change occurred in Substance B. C. A chemical change occurred in both substances. D. A physical change occurred in both substances.

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.