The need for communication

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Across
  1. 2. A good communication system enables ....communication
  2. 6. This type of organism is the most efficient
  3. 9. Any change in the environment that illicits a response
  4. 10. Enzymes also need a suitable...
  5. 13. A change in behaviour or physiology as a result of a change in the environment
  6. 14. In animals the internal cells and tissues are bathed in...
  7. 18. Cells undergo .... activities
  8. 20. A good communication system enables ....communication
Down
  1. 1. The neuronal system conducts signals very ....
  2. 3. A good communication system enables cells to ....
  3. 4. Hormones are only recognised by specific ....cells
  4. 5. The binomial name for the arctic fox
  5. 7. Enzymes need a suitable......
  6. 8. The term for a substance which is removed from the ....
  7. 11. Tissue fluid is the ....of cells
  8. 12. The hormonal system uses the ....to transport all its signals
  9. 15. Cells communicate by cell .....
  10. 16. The pH of carbon dioxide can be described as....
  11. 17. Enzymes need freedom from toxins and excess.....
  12. 19. A good communication system will ...the whole body