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2
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7
8
Across
- 2. Hard tissue in the skeleton
- 5. Unit of heredity on DNA
- 6. Burning ball of gas in space
- 8. Natural satellite of Earth
Down
- 1. A word related to science
- 3. Plant embryo in a protective coat
- 4. Curved glass that bends light
- 7. Smallest unit of an element