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Across 3. Occurs when two different species or organisms living in the same environment use the same limited resources (example: food, water, light, space) 5. That portion of the earth where life exists 7. A large geographical area that has a particular type of community 8. The diversity of life forms in an environment. 9. The development of plant communities on newly formed habitats that previously lacked plants 11. The study of the interactions of living things with each other and their physical environment 14. All the living things that directly or indirectly affect the environment 15. The second trophic level; these eat producers. 16. Organisms that can synthesize (make) their own food 20. The last trophic level; these organisms break down chemicals from dead organisms and return the materials to the soil. 22. The living community and the physical environment functioning together as an independent and relatively stable system 24. A place where organisms live 25. The third trophic level; these eat primary consumers. 27. A relationship in which one organism benefits at the expense of the other organism 29. The job or role an organism plays in its community 30. Animals that eat both plants and meat 32. Amount of light is an example of a/an __________ factor. 34. Plant-eating animals 35. Amount of moisture is an example of a/an __________ factor. 36. All the interacting populations in a given area 37. Both organisms benefit from the association

Down 1. The return of an area to its natural vegetation following a disruption or removal of the original community 2. Barnacles on a whale is an example of what type of relationship? 4. The maximum number of organisms the resources of an area can support 6. The first trophic level; these are always plants. 10. physical and chemical factors which affect the ability of organisms to survive and reproduces 12. combination of multiple food chains and how they are interconnected 13. One organism is benefitted and the other is unharmed 17. All the members of a species inhabiting a given location 18. Animals which kill and consume their prey 19. transfer of energy from green plants through a series of organisms with repeated stages of eating and being eaten 21. Meat-eating animals 23. Organisms that cannot synthesize (make) their own food 25. Those animals that feed on other animals that they have not killed 26. Athlete's foot fungus on humans is an example of what type of relationship? 28. Living together with another organism in close association 31. Temperature is an example of a/an __________ factor. 33. What percentage of energy is each consumer level able to get from the previous level?