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jfad21 jfad21
wrote...
Posts: 74
Rep: 1 0
9 years ago
Air flows into lungs because of
   a. temperature.
   b. ion flow.
   c. pressure gradients.
   d. magnetic attraction.
Read 1538 times
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Replies
wrote...
9 years ago
c. pressure gradients.
Post Merge: 9 years ago

c. pressure gradients.
jfad21 Author
wrote...
9 years ago
thanks!!
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