Across
- 3. the variable that changes
- 5. a visual representation of a system
- 8. part of the eye that widens and narrows to control the amount of light entering the eye
- 9. a small but exact version of something
- 11. to pass through
- 14. to bounce off
- 16. a pathway that takes electrical signals to the brain
- 17. see through
Down
- 1. a question that has variables
- 2. not transparent
- 4. parts
- 6. the variable that depends on changes made
- 7. agreement
- 10. part of the eye that turns light into electrical signals
- 12. a group of components working together for a common goal
- 13. a special mirror that transmits and reflects light
- 15. a way of making something reflective