Answer :
Respiratory system because it includes the esophagus lungs and bronchioles and nose and mouth
The digestive system.
The esophagus is an organ in the digestive system. An organ is a something that makes up an organ system. It is piece, or part, of the gastrointestinal (GI) tract. The gastrointestinal tract is the tube that goes from the mouth to the anus (bum). The GI tract includes the esophagus, stomach, small intestine and large intestine. These are all a part of the digestive system.
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