Between Jupiter and Uranus
The generally widely accepted first step of the scientific method is to ask a question.
This is where you think of a question which you want to do an experiment on, and then later on conduct an experiment to answer that question.
Answer:
The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system.
Writers note:
Who ever gave you that question is a horrible being. The digestive tract is quite complex. I hope I helped in some way; sorry if I confused you.