Cycle 3 Revision Term2

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Across
  1. 3. Transports air, food and water
  2. 6. Enable the exchange of oxygen
  3. 12. chemical reaction with oxygen and glucose as reactants
  4. 13. ... is a physical property of a substance
  5. 14. Muscles which allow the rib cage to contract
  6. 15. When a gas forms in a reaction ... are present
Down
  1. 1. Insects do not breathe with ...
  2. 2. Carry oxygen rich blood
  3. 4. If a substance has a pH of 12 it is ...
  4. 5. Potassium is stored in this
  5. 7. Insects use this - similar to scuba gear
  6. 8. Substances that react together
  7. 9. Number of elements that occur naturally as double atoms
  8. 10. Exterior openings on insects used for breathing
  9. 11. Naturally most things want to settle at a lower state of ...