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Across 1. study of organisms and environments 7. feeds on detritus 12. different populations living in the same area 15. all feeding relationships in an ecosystem 18. no two organisms can occupy the same niche or habitat at the same time 20. an organism that decomposes dead organisms

Down 1. everything in an environment 2. plant-eating organism 3. autotrophs 4. an organism that consumes other organisms 5. non-living things 6. natural changes in an ecosystem over time 8. a species that isn’t native to an area 9. changes that occur after a former community leaves 10. both plant and meat eating organism 11. colonization of barren land by communities 13. series of steps of organisms being eaten and eating 14. meat-eating organism 16. living things 17. number of organisms in an area 19. when both species benefit from a relationship