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August 4, 2015

Homework Help: physiology

Posted by Natash on Tuesday, November 11, 2008 at 8:32pm.

Pulmonary fibrosis may be caused by
a.smoking
b.allergic reactions
c.breathing in coal dust.
d.increased mucus production

I'm having trouble with this because doing research I found it to be smoking and breathing in coal dust. So I'm a bit confused.

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