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Across
- 3. A gas in the air that living things need to breathe
- 5. How tightly packed the matter is in something
- 6. A group of living things that are the same kind
- 7. A form of energy that allows us to see
- 8. A change in a living thing that helps it survive
Down
- 1. The force that makes magnets attract or repel
- 2. The part of an experiment that stays the same for comparison
- 4. A chemical change when substances interact