Definition for Revision history of "Air sac"

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  • (cur | prev) 19:26, 15 February 2011‎ Bio man (Talk | contribs)‎ . . (167 bytes) (+167)‎ . . (Created page with "A component of the avian respiratory system; air sacs—not lungs—expand when a bird inhales and shrink when it exhales, and they do not participate in gas exchange.")
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