Across
- 3. millions of cells working together
- 4. instructions for building an organism
- 5. 23 pairs
- 8. provides structure for the human organism
- 10. smallest unit of a living thing
- 12. the heart
- 13. the brain, spinal cord, neurons, and nerve endings
- 14. the lungs and trachea
Down
- 1. responsible for your physical traits
- 2. the mouth, the stomach, the intestines
- 6. allows for movement
- 7. A and T, G and C
- 9. all body systems work _________
- 11. the arteries, the capillaries, the veins
- 15. made up of multiple tissues