Researchers are investigating processes that happen durning digestion. Which answer choice describes only a physical change durning digestion?

Well, I think the question is incomplete, although I would answer you without seeing the options that the physical change that occurs in digestion is gastric movements, which are responsible for generating a motility of the food bolus so that it is digested more easily.

Furthermore, the impulse of the bolus towards the duodenum is not a coincidence but is also generated by autonomous movements generated by the digestive system.

Explanation:

Gastrointestinal motility is the physiological action of the digestive system responsible for displacing the contents of the mouth into the anus. The activity of smooth muscle cells and circular muscle cells is responsible for the movement of chyme through the digestive system