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Across 2. In a food chain or food web, an organism that relies on primary consumers for its principal source of energy; organisms at the third trophic level. 6. Describes any system with constant change in which the components can adjust to the changes without disturbing the entire system. 7. The removal of soluble minerals by percolation. 11. A category of living things defined by how it gains its energy; the first trophic level contains autotrophs, and each higher level contains heterotrophs. 12. A banded limestone structure containing fossilized bacterium. 13. A sequence linking organisms that feed on each other, starting with a food source and continuing in order with each consumer. 15. A community and its physical and chemical environment. 17. The top level of the region below the ground that is saturated with water 18. The biological or living components of the biosphere. 20. Jonathans uncle 23. The type of bond that is formed between the positive end of one water molecule and the negative end of another water molecule. 26. An organism that can synthesize organic compounds from inorganic chemicals without using solar energy. 27. The process by which green plants and some other organisms use solar energy, carbon dioxide, and water to produce carbohydrates. 28. The narrow zone around Earth that harbours life. 29. The loss of water through plant leaves. 30. a fire

Down 1. The process by which cells break down glucose into carbon dioxide and water,releasing energy. 3. The movement of a liquid through a porous material, such as soil particles. 4. The number of species in an ecosystem. 5. The non-living components of the biosphere. They include chemical and physical factors. 8. The cycle of matter in which carbon atoms move from an inorganic form to an organic form and then back to an inorganic form. 9. A molecule that has a positive and a negative end. 10. A scientific study of energy transformations, described by laws. 14. An organism that uses the Sun's energy and raw materials to make its own food; a producer. 16. In a food chain or food web, an organism that relies directly on autotrophs for its source of energy; organisms at the second trophic level. 19. The process by which non-photosynthetic organisms convert inorganic chemicals to organic compounds without solar energy. 21. An organism that is incapable of making it's own food, and so must feed on other organisms to gain energy. 22. A group of individuals of the same species occupying a given area at a certain time. 24. An autotroph; an organism that makes its own food. 25. The populations of all species that occupy a habitat.