# Biology

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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3. 👁 104

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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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