Across
- 4. a large region with similar climate and life forms
- 6. fats and oils used for energy and cell structure
- 8. balance of internal conditions in an organism
- 9. protein that speeds up chemical reactions
- 10. breaking down molecules using water
- 11. cell with a nucleus and organelles
Down
- 1. a testable explanation for an observation
- 2. apparatus organelle that packages and ships proteins
- 3. sugars and starches that give energy
- 5. community of living things and their environment
- 7. attraction between different substances
- 12. smallest unit of matter