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Across 3. A series of ecosystems that share the same characteristics. 5. The draining away of water from the surface of an area of land 8. The sum of all living and non-living things in an area or region 9. The layer of space around the planet that is capable of supporting life. 11. The total weight/mass of all living things in a given area 13. +/+ A relationship in which both living things benefit 14. +/- A relationship in which one living thing benefits while the other suffers in some way 15. A living thing that produces it's own food 17. The process plants use to take water from the soil 18. The living factors in an ecosystem 20. Water vapor released by living things 21. When water vapor in the air forms tiny droplets 23. An essential nutrient for living things; limiting factor for aquatic life. Not commonly found in the atmosphere 25. Two or more different kinds of living things that inhabit the same ecosystem and interact with one another in some way 26. A simple model that shows how matter and energy move through an ecosystem 28. A relationship in which one living thing benefits and the other is uneffected 29. A model that shows all the possible feeding relationships at each trophic level in a community 30. A living thing that gets energy from other living things 31. A single living thing

Down 1. The slow escape of water through porous material or small holes in the land 2. The study of relationships between the biotic and abiotic factors in an ecosystem 4. The role or position a species has in its environment; includes a biotic and abiotic interactions as an animal meets its need for survival and reproduction 6. When water in the atmosphere falls to earth 7. A group of the same living thing. Ex: a pack of wolves or a herd of elk 10. The place where an organism lives out it's life 12. Liquid water becoming vapor and rising into the atmosphere 15. Nonliving factors in an ecosystem 16. A living thing that gains energy by decomposing dead matter 19. Building block of all living things 20. Organism that represents a feeding step in the movement of energy and materials through an ecosystem 22. A component of proteins and a required nutrient for all living things 24. A relationship between two living things 27. Essential to all life