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Across 4. the process by which cells break down glucose into carbon dioxide and water, releasing energy 7. the movement of water through the environment from the atmosphere to Earth and back 10. all the organisms of various species that share a habitat or ecosystem 11. the movement of a liquid through a porous material, such as soil particles 12. an organism that uses the Sun's energy and raw materials to make its own food; a producer 13. a sequence linking organisms that feed on each other, starting with a food source and continuing in order with each consumer 15. the loss of water through plants leaves 17. the type of bond that is formed between the positive end of one water molecule and the negative end of another water molecule 21. a group of organisms of the same species that live in the same habitat or ecosystem at the same time 22. a community and its physical and chemical environment 23. a living factor that influences an organism 25. a representation of the feeding relationships among organisms in an ecosystem 26. in a food chain or web, an organism that relies directly on autotrophs for its source of energy; organisms at the second trophic level 27. the process by which non-photosynthetic organisms convert inorganic chemicals to organic compounds without solar energy 28. the narrow zone around Earth that harbours life 29. a banded limestone structure containing fossilized bacteria

Down 1. an autotroph; an organism that makes its own food 2. the removal of soluble minerals by percolation 3. an organism that is incapable of making its own food 4. an organism that can synthesize organic compounds from inorganic chemicals without using solar energy 5. a category of living things defined by how it gains its energy; the first trophic level contains autotrophs, and each higher level contains heterotrophs 6. in a food chain or web; an organism that relies on primary consumers for its principal source of energy; organisms at the thrid trophic level 8. describes any system with constant change in which the components can adjust to the changes without disturbing the entire system 9. the cycle of matter in which carbon atoms move from an inorganic form to an organic form and than back to an inorganic form 14. a molecule that has a positive and a negative end 16. the process by which green plants and some other organisms use solar energy, carbon dioxide, and water to produce carbohydrates 18. a non-living factor that influences an organism 19. a term used to describe the extent to which a surface can reflect light that strikes it 20. the boundary between the layer of soil that is saturated with water, and the unsaturated soil above it 24. the number of species in an ecosystem