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Across 1. Tundra, taiga, savanna, rainforest for example. p176 5. Most city dwellers are ??? of where their food and energy comes from. p194 7. original source of energy for life on earth. what a star. p 178 10. A change here has a knock-on effect across all levels. p 184 12. Vegetation, climate, animals, soils and people are ??? of an ecosystem p176 13. This percentage rule accounts for the loss of energy between trophic levels p186 16. Food ??? made growth of cities possible p192 19. This a small place for occupation in an ecosystem and can lead to endemism. p177 20. The functioning of this local river ecosystem is compromised by poor water quality. 21. element found in all living organisms p188 22. Waterfall on border of Argentina and Brazil p175 24. Decomposers include these and bacteria. p 187 28. Change in vegetation coverage of an area over time. P182 30. This is often a specialist process in fertilization involving a specific species. p181 32. Some forest leaves develop this quality to give them an advantage. p179 34. This key material for life coding is decreasing with species extinction. p191 35. This action leads to less conflict between the young of plants and animals p181 36. This community is at the opposite end of a continuum starting with the pioneers. p 182 37. non living p176 38. In the jungle this is often occupied by birds and insects. p 179 39. Survival depends on this. p178

Down 2. These are part of zooplankton p 184 3. This quality of ecosystems entails cycling nutrients between living and non-living matter. p 176 4. This is the least productive biome. p 190 6. the combination of food chains p 184 7. If these are strong they can help plants survive in a desert region. p179 8. Animals that feed on plants. p 183 9. All together these make up a species population. p177 11. Area where nutrient recycling happens the fastest. p 187 14. another word for combustion p 188 15. This combines with carbon dioxide to form sugar and carbohydrates. p 185 17. Sand barriers used by camels p180 18. Because all living things produce more progeny than can survive this is inevitable. p177 23. process of nitrates dissolving in soil. p 189 25. S.American country with extraordinary biodiversity. p190 26. process by which energy is produced from food. p 186 27. These plants are the primary producers. p 183 29. Farming started in this fertile place about ten thousand years ago. p 195. 31. Hunting was this kind of activity p192 33. An animal that prefers the forest floor. p179