What is the main difference between esophagus and the trachea?

What is the main difference between esophagus and the trachea?
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The trachea is a part of the respiratory system while theesophagus forms part of the digestive system. Since they belong todifferent systems, they perform separate functions. The trachea islarger and carries gasses in and out of the lungs. The esophagus issmaller and carries food from the mouth to the stomach.
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