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Answer:
1. Air enters the nose through inhalation and the chest cavity expands
2. From the nasal cavity, air moves further into the pharynx and the trachea
3. Cilia and the mucous lining in the tubes trap the tiny dust particles in the air before it enters the lungs
4. The air passes through the bronchi or bronchial tubes
5. The air moves further into small tubular branches called bronchioles
6. Air enters the alveoli
7. Oxygen and carbon dioxide exchange in the alveoli
8. Carbon dioxide is exhaled through the nose
The diaphragm moves back in