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Across 5. An animal that naturally preys on other animals 8. An organism that eats both plants and meat for energy. 9. The natural layering of ecosystems that occurs at distinct altitudes due to varying environmental conditions. 10. Refers to a foreign plant or animal – one that has been introduced into a new area. 12. A network of interconnected food chains in an ecological community. 14. The total of all of the surroundings – air, water, vegetation, human element, wildlife – that has influence on you and your existence, including physical, biological and all other factors; the surroundings of a plant or animal including other plants and animals, climate and location. 18. The process by which green plants produce their food (carbohydrates) from water, carbon dioxide, and minerals, using the sun’s energy 22. The natural environment of a plant or animal. 23. Any relationship between two or more organisms in which the organisms somehow affect each other. 24. The interrelationships of wildlife with one another and with the various elements of their environment. 25. Any living thing that has living characteristics and is composed of one or more cells.

Down 1. A group of organisms that occupy the same position in a food chain. 2. All the organisms that constitute a specific group or occur in a specified habitat. 3. The ecological role of an organism in a community. 4. Animals that are killed and eaten by other animals 5. An organism that uses the sun’s energy for producing food. 6. The dying out or termination of a species. 7. A symbiotic relationship between organisms in which both organisms are benefited, and could even be dependent on one another 11. Species that are non-native to an ecosystem and whose presence causes economic harm, environmental harm, and/or harm to human health. 13. Anything that can limit the size of a population, including living and nonliving features of an ecosystems, such as predators or drought 15. A place that can support the life and growth of an organism 16. An interconnected chain of organisms related to energy transfer that indicates which are predators and which are prey in relation to one another. 17. An organism that eats plants for energy. 19. A symbiotic relationship between organisms in which one organism benefits (the parasite) and the other is harmed (the host). 20. Active by night; sleep during the day. 21. Organisms that can reproduce with each other. 23. Physical and biological materials and their intertwined processes. Natural systems exist in nature without any human involvement