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Across 1. organisms unable to make their own food 4. nonliving parts of the environment 7. interbreeding individuals of one species that compete with one another for food, water, and mates and live in the same place at the same time 8. organisms that play beneficial roles in all ecosystems by breaking down and absorbing nutrients from dead and decaying organicmatter 9. symbiotic relationship beneficial to both species 10. coastal body of water in which both frewhwater and saltwater mix 11. collection of niches in which an organism lives 15. biome composed of large communities of grasses and other small plants 16. large areas with the same type of climax community 17. development of living communities from bare rock, where pioneer species such as lichens are often followed by small plants, then trees 19. biome in which an even amount of precipitation falls in all four seasons; includes hardwood trees that lose their foilage annually 21. scientific study of interactions between organisms and their environments 24. symbiotic relationship in which one species benefits and the other species is neither harmed nor helped 27. portion of the marine biome shallow enough for the sun to penetrate 29. biome located just south ot the tundra 30. any factor limiting hte survival and productivity of organisms 31. role of a particular species in a community regarding food, space, reproduction, and how it interacts with abiotic factors 33. microscopic organissm found floating in the photic zone 34. populations in a community and abiotic factors with which they interact 35. animal that plays a positive role in the ecosystem by consuming dead organisms and their refuse 36. treeless biome south of the ice cap of the north pole

Down 2. most biologically diverse terrestrial biome 3. symbiotic relationship in which one species benefits at the expense of he other species 5. part of the shoreline between the high and low tide lines 6. living partos of the environment 12. life-supporting portions of Earth composed of air, land, fresh water, adn salt water 13. permanent, close association between two organisms of different species 14. stable, mature community that undergoes little ecological succession 18. ahsows all the possible feeding relationships in a community at each trophic level 20. a possible route for the transfer of matter and energy through an ecosystem 22. link represented by each organism in a food chain 23. layer of permanently frozen ground found under the topmost layer of soil in the tundra 25. marine biome that never receives sunlight because of water depth 26. several interacting populations that inhabit a common environment 28. organisms that are able to synthesize food using sun energy or energy stored in chemical compounds 32. driest biome south of the taiga; receives less than 25cm of precipitation annually, and produces a range of vegetation including shrubs