Air and the Respiratory System

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Across
  1. 4. Air is made up of a __________ of gases.
  2. 6. Needed for respiration.
  3. 7. Mosquito larvae use breathing _____ to breathe.
  4. 9. Taken in by plants for photosynthesis.
  5. 10. Process of taking air into body and giving it out.
  6. 11. Most abundant gas in air.
Down
  1. 1. The tube that leads to the lungs from the nose.
  2. 2. Openings on leaves that allow gases to pass through.
  3. 3. The muscle that changes the size of the chest cavity.
  4. 5. The _____ system helps living things to breathe.
  5. 8. Gas _____ happens in the lungs for humans.