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Across 3. organism that can make its own food 4. the carbohydrate form of excess glucose stored in plants 6. a mixture of decomposing plants and soil 11. a living thing that breaks down dead plants and animals, returning their chemical elements to the environment 12. eats primary consumers 15. the source of the ability to do work, move or cause change 17. a model that shows the relative numbers of organisms or amount of energy available at each level in a food chain 19. the re-use of water in nature through condensation, precipitation, evaporation/transpiration 20. a sugar produced during photosynthesis 21. organism that eats a producer or another consumer

Down 1. eats plants or producers 2. chemical change that takes place within a cell, converts food into energy 3. model showing the total amount of chemical energy that flows through each feeding level in a food chain 5. a model that shows how energy and matter pass from one organism to another in an ecosystem 7. occurs when plant cells convert sunlight, water and CO2 into glucose and O2 8. the re-use of carbon in nature through photosynthesis, cellular respiration and decomposition 9. eats secondary consumers 10. the sum of a community of living things and the environment in which they live 13. the re-use of nitrogen in nature through food chains, decomposition and fixing/producing bacteria 14. the re-use of oxygen in nature through photosynthesis, cellular respiration and decomposition 16. a diagram that shows the feeding relationships between organisms in an ecosystem 18. the re-use of matter in an ecological system