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2. an arthropod of the large, mainly aquatic group Crustacea, such as a crab, lobster, shrimp, or barnacle
4. organisms convert inorganic compounds (such as hydrogen gas, hydrogen sulfide, or ferrous ions) into organic matter
5. Areas characterized by the presence of water
7. the global ecosystem
8. organism that can produce their own foods
11. a substance that provides nourishment essential for growth and the maintenance of life
14. the exhalation of water vapor through the stomata
16. step in a nutritive series, or food chain, of an ecosystem
18. Microbially facilitated process

1. the process by which water is transferred from the land to the atmosphere by evaporation from the soil and other surfaces and by transpiration from plants
3. microscopic organisms break down nitrogen-containing chemicals from dead organic matter into simpler substances like ammonia
6. the process of taking in and fully understanding information or ideas
7. wet muddy ground too soft to support a heavy body
9. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
10. a body of permeable rock which can contain or transmit groundwater
12. Biome of coniferous forests
13. a vast, flat, treeless Arctic region of Europe, Asia, and North America in which the subsoil is permanently frozen
15. relating to water
17. renewable organic matter derived from plants and animals
19. the branch of biology that deals with the relations of organisms to one another and to their physical surroundings