Question

physical and chemical changes occur during digestion. an example of a chemical change during digestion is
a teeth chewing the food.
b the mouth swallowing food.
c the esophagus moving food.
d enzymes breaking down food.

Explanation:

A chemical change results in the formation of new substances. Enzymes breaking down food involve chemical reactions that change the chemical composition of food. Chewing, swallowing, and esophagus - movement are physical changes as they only change the physical state or position of food, not its chemical nature.

Answer:

D. enzymes breaking down food