Ecosystems

2. interaction between two different organisms living in close physical association, typically to the advantage of both.
3. an animal that is hunted and killed by another for food.
4. the process of a substance in a liquid state changing to a gaseous state
9. an organism that lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense.
14. the chemical processes by which atmospheric nitrogen is assimilated into organic compounds, especially by certain microorganisms as part of the nitrogen cycle.
15. symbiosis that is beneficial to both organisms involved.
18. exist at the same time or in the same place.
19. an animal or plant on or in which a parasite or commensal organism lives.
20. the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition.
22. an animal that naturally preys on others.
23. the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land

1. water held underground in the soil or in pores and crevices in rock.
3. relationship between two things in which one of them (the parasite) benefits from or lives off of the other
5. rain, snow, sleet, or hail that falls to the ground.
6. interaction between organisms, populations, or species, in which birth, growth and death depend on gaining a share of a limited environmental resource.
7. the state or process of rotting; decay.
8. an association between two organisms in which one benefits and the other derives neither benefit nor harm.
10. the process where plants absorb water through the roots
11. the series of processes by which carbon compounds are interconverted in the environment
12. the preying of one animal on others.
13. the loss or removal of nitrogen or nitrogen compounds
16. the process of working together to the same end.
17. the draining away of water
21. water that collects as droplets on a cold surface when humid air is in contact with it.