Across
- 5. 21% of our atmosphere; used during respiration; made during photosynthesis
- 8. body's main source of energy; contains carbon
- 11. __ in roots of plants convert nitrogen into a usable form
- 13. atmospheric water vapor cooling and condenses forming clouds
- 14. animals take plant proteins and digest them
- 15. most abundant gas in atmosphere; found in proteins
- 16. all organisms go through this to make ATP and CO2
Down
- 1. natural cycle that ciculates water from earth to atmosphere and back again
- 2. process producers use to make glucose and oxygen
- 3. water leaving earth into atmosphere
- 4. any form of water falling from atmosphere
- 6. gaseous form of water; water __
- 7. when organisms die, they __
- 9. gas released during cellular respiration
- 10. breaks down nitrogen bonds
- 12. remains of organic matter found in earth that release CO2 in atmosphere when burned