Across
- 1. tissue is a collection of cell
- 3. what system breaks down food
- 6. what system controls all body functions
- 8. is the smallest unit of life
- 9. what protect heart
- 10. what protect brain
Down
- 2. what system protects organ
- 4. what system allows exchange of gases
- 5. what system transports blood
- 7. what system works for bone