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Across 6. is made of interconnected food chains 8. captures and eats prey 9. vast, flat, treeless arctic region 11. the order of living things eating one another 13. main food source plants 14. organisms that break down dead remains 16. living things in an ecosystem 17. flood, earthquake or hurricane caused by nature 18. main food source meat 20. they eat organisms from a different population 21. the interaction of all species in a given area 23. natural home of an organism 24. barren area with little precipitation

Down 1. organisms able to make food using abiotic elements 2. non-living and physical parts of an environment 3. area with prairies and perennial grasses 4. an animal that is hunted as food 5. eats dead organisms 7. Earth's atmosphere heating up due to greenhouse effect 10. forested landscapes bounded by the tropics of Cancer and Capricorn 12. clearing a widespread area of trees 15. man-made waste 16. living things suited for a specific environment 19. eats plants and animals 22. subarctic region with pine, spruce and larch trees