All structures involved in the breakdown of food constitute the digestive system.
What is digestive system?
The digestive system is the system in the body that deals with the breakdown of food substances to release nutrients.
The digestive system commences from the mouth and goes all the way to the small intestine before the undigested food materials are excreted from the body.
The question is complete and the diagram is not shown however, all structures involved in the breakdown of food constitute the digestive system.
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