Respiratory System

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Across
  1. 1. Ccommon passage for air as well as food
  2. 3. Framework of cartilaginous structure
  3. 4. Balloon-like structures
  4. 6. Another term for trachea
  5. 7. Primary organs of respiration
Down
  1. 2. The respiratory pigment which has a very high affinity for oxygen
  2. 5. Another term for voicebox