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Across 1. any system with constant change in which the components can adjust to the changes without desturbing the entire ecosystem 4. the process by which green plants and some other organisms use solar energy,carbon dioxide, and water to produce carbohydrates 6. an organism that makes its own food 10. a category of living things deefined by how it gains its energy 13. an organism that relies directly on autotrophs 14. a species sensitive to small changes in environmental conditions 18. the process in which nitrates are converted to nitrites and then to nitrogen gas 19. slowly decomposing plant matter produced in low-oxygen environments such as bogs 20. waste from plants and animals, including their dead remains 21. the total dry mass of all living material in an ecosystem 24. an organism that can synthesize organic compounds from inorganic chemicals without using solar energy 26. the populations of all species that occupy a habitat 27. an organism that feeds on detritus 28. the movement of a liquid through a porous material 29. a material used to restore nutrients to plants 30. cultivation of a single species

Down 2. two processes in which atmospheric or dissolved nitrogen is converted into nitrate ions 3. electromagnetic radiation from the Sun that can cause burning of the skin and cellular mutations 5. a scientific study of energy transformations, described by laws 7. the process by which non-photosynthetic organisms convert inorganic chemicals to organic compounds without solar energy 8. a molecule that has a positive and negative bond 9. the extent to which a surface can reflect light that strikes it 11. the chemical reaction that occurs when a substance reacts very quickly with oxygen to release energy 12. the loss of water through plant leaves 15. the cycling of phosphorus between the biotic and abiotic components of the environment 16. the removal of soluble minerals by percolation 17. a banded limestone structure containing fossilized bacteria 22. a sequence linking organisms that feed on eachother 23. the non-living components of the biosphere 25. an organism that must eat producers or other consumers to survive