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BJL BJL
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6 years ago
Gas exchange occurs within the minute air sacs of the lungs called
 A) alveoli.
  B) trachea.
  C) bronchi.
  D) terminal bronchioles.
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ishgupishgup
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6 years ago
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BJL Author
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6 years ago
Smart ... Thanks!
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Yesterday
Thanks
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2 hours ago
Good timing, thanks!
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