Both the esophagus and the small intestine are involved in the digestion of food. The esophagus squeezes food into the stomach by wave-like contractions. Enzymes in the stomach break food molecules into smaller molecules.
Which statement best describes changes to food during digestion?
A. The muscle contractions result in physical changes, while the action of the enzymes result in chemical change.
B. The muscle contractions result in chemical changes, while the action of the enzymes result in physical changes.
C. The muscle contractions and the action of the enzymes both result only in physical changes.
D. The muscle contractions and the action of the enzymes both result only in chemical changes.