Across
- 3. lets certain substances in and out of the cell
- 5. extra protection
- 7. first stage of respiration
- 8. second stage of respiration
- 9. surrounds the nucleus
- 13. very big in plant cells
Down
- 1. sends substances to othe parts of the cell
- 2. passage ways through the cell
- 4. control center
- 6. photosynthesis
- 10. makes useful substances
- 11. makes protiens
- 12. makes ribosomes
