What scenario is an example of a physical change? A. Wood is burned in a campfire and is turned into ash
B. a piece of metal is left in the rain and form dust
C. Lead is melted into liquid to form dust
D. Yeast turns sugar into energy, water, and carbon dioxide

Which of the following statements best distinguishes a hypothesis from a theory? a. theories are hypotheses that have been proved. b.hypotheses are guesses; theories are correct answers c. hypotheses usually are relatively narrow in scope; theories have broad explanatory power. d. theories are proved to be true; hypotheses are often contradicted by experimental results.