Mucus and Cilia help filter dust and dirty. Cilia are small, hair like structures in the nasal passage and trachea. Mucus is also found in the nasal passage and trachea.
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A
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the reason is because it is more direct and lets them know
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not sure if this is a test question or an actual question, but I complete school work, while im in jail :)
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do wants us to say a rock or something else?
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