Across
- 2. - Main organ of the respiratory system
- 4. - The jelly-like substance that fills the cell
- 6. MEMBRANE - The skin of a cell
- 7. - The process by which plants use sunlight, water, and carbon dioxide to create food
- 10. - Main organ of the circulatory system
- 13. - The process by which living things take in oxygen and release energy
- 15. - Tiny structures in the cell that are sometimes called the "powerhouses" of the cell
- 16. - Control center of the nervous system
- 17. - The soft part of the body
- 18. BLOOD CELL - The type of blood cell that fights infection
Down
- 1. CORD - Part of the nervous system that runs down the back of the body
- 2. - Main organ of the digestive system
- 3. - The control center of a cell
- 5. - The hard part of the body that protects the internal organs
- 8. - Part of the digestive system where food is broken down
- 9. - Part of the digestive system where nutrients are absorbed from food
- 11. - The molecule that holds the genetic instructions for an organism
- 12. - Main organ of the urinary system
- 14. BLOOD CELL - The type of blood cell that contains hemoglobin, a protein that carries oxygen through the bloodstream