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2
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5
6
Across
- 2. A group of living things that are the same kind
- 4. A hard solid piece of the Earth made of minerals
- 5. How often something happens in a given time
- 6. A gas in the air that living things need to breathe
Down
- 1. The tiny building block that makes up all living things
- 3. The steps followed to do an experiment