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5
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7
8
9
10
Across
- 1. Center of an atom or cell
- 5. Smallest discrete unit of energy
- 6. Preserved remains of ancient life
- 7. A word related to science
- 9. Force attracting objects to Earth
- 10. Slow-moving river of ice
Down
- 2. Group of similar living organisms
- 3. Biological catalyst for reactions
- 4. Positively charged particle
- 7. Naturally occurring inorganic solid
- 8. Fourth state of matter