Tyler clarke

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Across
  1. 3. liquid waste
  2. 5. uses O2, removes CO2
  3. 8. exit tube
Down
  1. 1. regulates liquid in the blood
  2. 2. small part of kidney that filters blood
  3. 4. tiny air sacs in lungs
  4. 6. space in chest
  5. 7. brings in O2,removes CO2