Across
- 3. Protein that speeds up chemical reactions in the body
- 4. An educated guess in the scientific method
- 5. A microscopic, single-celled organism
- 8. Chemical messenger in the body
- 9. Process of liquid turning into gas
- 10. Force that pulls objects toward the center of Earth
- 13. Wearing away of Earth's surface by wind or water
- 16. Powerhouse of the cell
Down
- 1. Speed of an object in a given direction
- 2. Green pigment in plants for photosynthesis
- 5. Process by which plants make energy
- 6. Bending of light as it passes through different materials
- 7. Macromolecule for body structure and function
- 11. Force that resists motion between surfaces
- 12. Molecule carrying genetic information
- 14. Smallest unit of matter
- 15. Substance with a pH lower than 7