Final answer:
The prefix Gastro- refers to the gastrointestinal tract of the body, which includes the mouth, pharynx, esophagus, stomach, small intestine, and large intestine.
Step-by-step explanation:
Gastro- is a prefix referring to the gastrointestinal (GI) tract of the body. The GI tract includes the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. It is responsible for the digestion and absorption of food.