Question

which of the following is not an organ of the respiratory system? a lungs b esophagus c trachea d nasal cavity

Explanation:

The lungs are the main organs for gas - exchange in respiration. The trachea is the airway that leads to the lungs. The nasal cavity is the initial part of the respiratory tract for air entry and filtering. The esophagus is part of the digestive system, which transports food from the mouth to the stomach, not the respiratory system.

Answer:

B. esophagus