Answers

2014-06-06T18:43:36+08:00
Essentially I thought it was the lungs, but then I was reading Prentice Hall Science Explorer  for Grade 9 and the book said that the "grapes" are often associated with the alveoli. 
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2014-06-08T10:47:22+08:00
Main stem = trachea     large branching stem = bronchi       little stem = bronchioles       the individual grapes = alveoli
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