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