Across
- 3. reaction metabolism
- 6. prediction
- 9. well tested explanation
- 11. process by which plants make sugars
- 14. an experiment in which only one variable is changed
- 15. cells with walls
- 16. genetic material
- 18. microrganisms in your gut
- 19. planet biosphere
Down
- 1. negatively charged particle
- 2. the study of life
- 4. cells with membranes
- 5. constant internal conditions
- 7. pure substance
- 8. power plant of the cell
- 10. molecule of water
- 12. scientific studies begin with this
- 13. an organized way of gathering and analyzing evidence
- 17. a signal