a phase change. a cellular change. a physical change. a chemical change.
I gave my students this multiple choice question: When a person chews, saliva from the mouth mixes with starches in food. These starches begin to turn into sugars. Changing starches into sugars is best described as

Only one answer is correct among these 4 choices:
- a phase change.
- a cellular change.
- a physical change.
- a chemical change.

Could you tell me which one is correct?

a chemical change.