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Across
- 2. The remains of a plant or animal from long ago preserved in rock
- 4. A substance made of two or more elements bonded together
- 6. A change in a living thing that helps it survive
- 7. A form of energy that allows us to see
- 8. Any living thing such as a plant or animal
Down
- 1. Carefully watching and noting what happens
- 3. A mixture where one substance dissolves completely in another
- 5. Anything that takes up space and has weight