1
																								2
												3			4
						5				6
								7									8		9
																													10
												11							12
	13
14															15
						16
														17
	18										19		20
			21
					22
																						23
								24
	25														26
		27												28
															29
30

Across 1. autotroph 4. nonphotosynthetic organisms convert inorganic chemicals to organic compounds without solar energy 11. decomposing plant matter produced in low oxygen environments 12. cultivation of a single species 14. a sugar 15. the loss of water through plant leaves 16. electromagnetic radiation from the Sun 17. narrow zone zround Earth that harbours life 20. molecule that has a positive and negative end 22. dissolved nitrogen is converted into nitrate ions 24. pyramid made of the numbers of organisms at each trophic level 25. catergory of living things defined by how it gains its energy 26. group of individuals of the same species occupying a given area at a certain time 27. removal of soluble minerals 28. linking organisms that feed on each other 29. animal that eats both plants and animals 30. number of species in an ecsystem

Down 2. can synthesize organic compounds from inorganic chemicals without using solar energy 3. rain and snow 5. a system by which components can adjust to changes without disturbing the entire system 6. scientific study of energy transformations, described by laws 7. carbon dioxide + water + energy --> glucose + oxygen 8. glucose + oxygen --> carbon dioxide + water + energy 9. dry mass of all living material 10. waste from plants and animals, including their dead remains 13. extent to which a surface can reflect light that strikes it 18. a chemical that is essential to living things 19. heat energy 21. organism that feeds on detritus 23. restores nutrients to plants