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Across 1. a continuos and circular process often involving carbon, nitrogen or water 5. an organism (generally bacteria) that decompose dead organisms 9. The amount of salt present in an environment 11. An area that an ecosystem is found in that is made up of biotic and abiotic factors 12. anything non living that affects an environment 14. having nutritional habits or requirements 15. The process in which plants convert carbon dioxide and water into oxygen and glucose in the presence of light 16. A relationship in which one organism benefits and the other is unaffected 17. A relationship in which both organisms benefit 19. The increasing concentration of a substance as it moves up a food chain 21. A relationship in which one organism is harmed and the other benefits 22. The process in which oxygen and glucose are converted into carbon dioxide and water 24. An environment on land 28. eroded matter 29. The population of a species within a certain area 30. Anything living that affects an environment 31. An organism that eats another organism to obtain its energy 33. a square area that can be studied in order to determine the approximate abundance of an organism within an ecosystem 34. an organism that eats plants to obtain its energy

Down 2. An organism that eats animals to obtain energy 3. The matter that is created by plants during photosynthesis and moves through an ecosystem by means of a food web 4. A change in an organism passed on through genes that makes an organism better suited to their environment 6. The name for increased plant growth within a waterway that prevents light from entering the aquatic environment and removes the amount of dissolved oxygen within the water 7. The amount of biological mass found within an environment 8. The area that an organism is found in 10. An environment in water 13. The name for the contest of resources and land 18. A line in which areas can be studied at different points to determine how they change over distance 20. A relationship in which one organism is changed by another 21. the abbreviation for potential Hydrogen 23. An organism that obtains its energy by means of photosynthesis 25. a biological community of interrelating organisms 26. An organism that hunts another animal for food 27. The unit that the amount of light is measured in 32. An organism that is consumed by another organism