Our Body Systems

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Across
  1. 1. The main organ in respiratory system
  2. 4. The left lung is ... than the right lung
  3. 5. The first part of digestive system
  4. 7. To take care of our health, we must drink plenty of ...2
Down
  1. 2. Air enters our respiratory system through ...
  2. 3. The circulatory system carries ... to all of our body.
  3. 6. ... pumps blood continuously to the whole body.