Asked by Anna
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 __________.
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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