Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[EX Q]: Question: Where does the process of digestion start? Answer: mouth
[EX A]: Digestion starts in the mouth. When food is swallowed, it travels through the esophagus to the stomach. In the stomach, digestion continues and a small amount of absorption of nutrients takes place.

[EX Q]: Question: Metabolism is controlled by regulation of what? Answer: enzyme activity
[EX A]: 8.5 Regulation of enzyme activity helps control metabolism.

[EX Q]: Question: What forms when the metal sodium gives up an electron to the nonmetal chlorine? Answer: an ionic bond
[EX A]:
An ionic bond forms when the metal sodium gives up an electron to the nonmetal chlorine.