Across
- 2. _ forms when organic matter is not fully decomposed because of anaerobic conditions in waterlogged soils.
- 4. What is exchanged between a sealed mesocosm and the surrounding external environment?
- 6. Type of heterotroph that obtains nutrients from non-living organic sources. (ie. humus)
- 8. Where does methane emitted from?
- 9. _ is produced from organic matter in anaerobic conditions by methanogenic archaeans and some diffuses into the atmosphere
- 12. In carbon cycle, what process changes carbon in coal to carbon dioxide?
- 13. Heterotrophs that obtain organic nutrients from dead organic matter by external digestion
- 15. Organisms of a species living together in the same area
- 16. The increase in the combustion of _ organic matter cause an increase in the atmospheric carbon dioxide.
- 18. Represents the lowest level on the pyramid of energy.
- 19. Animals such as reef-building corals and molluscs have hard parts that are composed of calcium carbonate and can become fossilized in _
Down
- 1. In aquatic habitats _ is present as a dissolved gas and hydrogen carbonate ions.
- 3. Ocean _ become more severe if the carbon dioxide concentration of the atmosphere increases.
- 5. Which gas have made the most significant contribution to the global warming other than carbon dioxide?
- 7. Energy released by respiration is used in living organism and converted to _
- 10. _ synthesize nutrients by converting inorganic into organic molecules
- 11. Members of different species breed together
- 12. Different species living and interacting with each other in a specific area
- 14. Organism that are not exclusively autotrophic or heterotrophic
- 17. Main supply of energy