Fitness Crossword Puzzle

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Across
  1. 4. (pharynx)
  2. 5. are made of three parts
  3. 7. body has billions of nerve cells
  4. 8. vessels
Down
  1. 1. side
  2. 2. side
  3. 3. box (larynx)
  4. 5. may look different from one another
  5. 6. are programmed to do different things