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1) Mucus traps __________.

2) The windpipe is lined with sticky __________ and microscopic __________.
3) Tiny microscopic __________ are called cilia.

3 answers

I'll be glad to check your answers.
1 bacteria
2 I don't know
3 cells?
http://www.innerbody.com/image_card06/card13.html#full-description

http://dictionary.reference.com/browse/cilia
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