Across
- 4. the layer that protects bones and muscles
- 5. The middle layer of the skin
- 9. The skin system
- 10. you breathe air in
- 12. The system that contains the heart
Down
- 1. organ that helps you breathe
- 2. removes waste from the body
- 3. transform water into urine
- 6. the breathing system
- 7. The top layer of the skin
- 8. Carries blood in them
- 11. Pumps blood to the body