Across
- 1. breaks down bacteria from other organisms
- 3. turns glucose into pyruvate
- 4. cycle that uses oxygen to produce energy
- 6. envelope of gasses the earth or other planets
- 7. transfers and provides cell with energy
- 10. sphere with lakes and ponds
- 13. a source of energy
- 15. uses light energy to make molecules neccesary for next step of photosynthesis
- 16. absence if free oxygen
- 18. sphere where life lives
- 20. a chemical element
Down
- 2. process where plants turn light energy into chemical energy
- 5. any substance that has mass and takes up space
- 8. sphere with rocks and minerals
- 9. membrane cell organelles
- 11. gives green plants their pigment
- 12. chemical reactions that break down glucose
- 14. substance that changes into a chemical reaction
- 17. involves free oxygen
- 19. carbon reaction