Respiratory system

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Across
  1. 2. a dome like structure that helps with ventilation
  2. 3. to the branchioles
  3. 5. air moves down from the throat connecting to another part
  4. 6. air sacks that v
  5. 8. air comes down from it
Down
  1. 1. will extend into a part like a tree
  2. 4. branches out into two slightly smaller parts
  3. 7. gaseous exchange happens here