Across
- 2. respiration How cells get energy from food.
- 4. Tiny early life forms that made oxygen, also called “blue-green algae.”
- 7. Clear liquid plants need to live, chemical formula H₂O.
- 9. The way plants make food using sunlight.
- 10. The starting ingredients in a science experiment or reaction.
Down
- 1. Two or more atoms stuck together.
- 3. The idea that matter isn’t lost or made, just changed.
- 5. The green parts of plant cells where food is made.
- 6. A gas we breathe out that plants need.
- 8. What you end up with after a reaction.