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Across 1. A very cold biome with little rain; generally in the most northern areas of the world. 2. The place in which an organism live. 6. Corals are ____________ that have a special relationship with algae. 7. A long term relationship between different species. 8. A biome partly covered with water or is flooded at least part of each year. 9. ____________ can not reach biomes in the deeper areas of the ocean, so no plants can grow there. 13. Made up of all the populations in an area. 15. The ______________ parts of an ecosystem include air, water, soil, temperature and sunlight. 16. The main biomes found in Europe ant the eastern half of the USA. 17. The role that an organism has in an ecosystem. 18. Water ecosystem which may have slow or fast flow.

Down 1. Biomes that are in cold and fairly dry places and all in the Northern Hemisphere. 3. The land biome with the more species. 4. A large ecosystem with generally the same climate and organisms. 5. All the living and nonliving things in an area. 10. Biomes that are covered with many types of grasses and have few trees. 11. A group of organisms of one species. 12. A repeating process or a repeating flow of material through a system. 14. Areas that receive less than 25 cm of rain or snow each year.