1) Microscopic hairs of the windpipe are always __________.
2) The cilia of the windpipe move harmful substances __________.
3) You build a heavy gust of air when you __________ or __________.
4) Coughing and sneezing help push harmful substances from the __________.

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asked by Anna
  1. Anna/Ben/A/Anonymous -- please use only one name for your posts.

  2. I have any idea for these.

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    posted by Anna
  3. funk you all they no answer !@#$%^&

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