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Across
- 4. The passing of traits from parents to their children
- 6. A hard solid piece of the Earth made of minerals
- 7. A sudden shaking of the ground caused by movements deep inside Earth
- 8. A sample of something used for study
Down
- 1. A gas in the air that living things need to breathe
- 2. The process of getting bigger or more developed
- 3. A thread-like structure in cells that carries genetic information
- 5. A community of living things and their environment working together