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Across
- 3. A natural solid substance found in the earth
- 5. A group of living things that are the same kind
- 6. A thread-like structure in cells that carries genetic information
- 7. A test done to discover something new
- 8. A community of living things and their environment working together
Down
- 1. A form of energy that makes things warm
- 2. A tool that makes very tiny things look bigger
- 4. The speed of something in a given direction