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Dust you breathe in is swept out of the trachea by the beating of:

AMotor nerves
BTiny cilia
CLong flagella
DSmooth muscle
Answer & Solution
Correct answer: B. Tiny cilia
1. The trachea is lined by ciliated epithelium. 2. The cilia beat in a coordinated way. 3. They sweep dust and foreign particles out. _Source: syllabus Biology, Chapter 20, Locomotion and Movement._
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