Describe the effects of cigarette smoking on the inner walls of the trachea of human beings.

Cigarette smoking damages the cilia lining the trachea, reducing their ability to clear mucus and dust. This leads to mucus buildup, irritation, and chronic cough. Smoking also increases the risk of lung infections, bronchitis, and lung cancer.

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  2. Name the ways through which a plant can obtain oxygen.
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