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Across
- 1. A word related to science
- 3. Relating to sight or light
- 4. Focused beam of coherent light
- 6. Protective gas layer in atmosphere
- 8. Plant life of a region
- 11. Simple machine for lifting
Down
- 2. A word related to science
- 5. Biological classification rank
- 7. Compound of oxygen and another element
- 8. Push or pull on an object
- 9. Part of body with a function
- 10. Fiber that transmits signals