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Across 4. all of the populations that live in an area at the same time 5. relationship in which one animal hunts, kills, and eats another 7. organism that cannot make their own food 11. how an organism acts in its ecosystem 13. the variety of life in the world in a particular habitat or ecosystem 14. occurs when organisms in an ecosystem try to get the same resources 16. organism that produces its own food 17. graphical representation of the trophic levels (nutritional) by which the incoming solar energy is transferred into an ecosystem 18. a network of interconnected food chains in an ecosystem 20. includes all living and nonliving parts of the environment as well as the interactions among them 21. animals that kill and eat each other 22. biotic and abiotic factors that prevent the continuous growth of a population 23. carbon moves among the air, the ground, and the plants/animals 24. each feeding level in an ecosystem 25. relationship in which both species benefit 26. relationship where one species benefit without benefiting or harming the other species 27. this ecosystem includes wherever there is water/salt water 28. the movement of nitrogen through the environment 29. close relationship between two different species of organisms living together

Down 1. an organism that produces its own food; also called producers 2. all organisms of a species that live in the same place at the same time 3. includes land, water, and the lower part of the atmosphere 5. animals that are killed and eaten 6. Organisms that live in the same habitat but rely in different resources 8. organisms that cannot make their own food; also call consumers 9. an organism that gets energy by breaking down the remains of dead organisms and the wastes of living organisms 10. living parts of an ecosystem; includes remains and waste 12. this ecosystem is found on land 15. describes the number of individuals in a given area 19. non-living parts of an ecosystem: includes light, temperature, weather, soil, and water 21. relationship between a parasite and its host