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Across
- 3. Large molecule essential for life
- 5. Preserved remains of ancient life
- 8. Pure substance on periodic table
- 9. A word related to science
- 10. Force attracting objects to Earth
- 11. Center of an atom or cell
Down
- 1. Wearing away of land by water or wind
- 2. Biological catalyst for reactions
- 4. One body blocking another in space
- 6. Diffusion of water through a membrane
- 7. Device for controlled nuclear reactions
- 9. Positively charged particle