Interactions and Ecosystems

5. species having no living members; no longer in existence.
8. living things
10. interaction between two organisms where one benefits and another is not affected
11. a number of people or things sharing a specified characteristic and following one after the other.
13. the total quantity or weight of organisms in a given area or volume.
14. the water found underground
16. organisms that eat other organisms
17. the impact of a person or community on the environment, expressed as the amount of land required to sustain their use of natural resources.
20. the draining away of water
21. an animal that feeds on flesh.
23. relationships between different organisms
24. an animal that feeds on dead animals, dead plant material, or refuse.
25. symbiosis that is beneficial to both organisms involved.
26. the role an organism plays in an environment
28. species essentially "non-native" species
29. water which collects as droplets on a cold surface when humid air is in contact with it.

1. a substance that pollutes something
2. a biological community of interacting organisms and their physical environment.
3. an animal that feeds on plants
4. interaction between two different organisms living close to each other
6. the exhalation of water vapor through the stomata.
7. a parasite living in or on another organism.
9. anything that performs photosynthesis
12. how carbon is cycled throughout the environment
15. an organism that breaks down organic matter
17. the process of turning from liquid into vapor.
18. an animal or person that eats food of both plant and animal origin.
19. the accumulation over time of a substance and especially a contaminant (such as a pesticide or heavy metal) in a living thing
22. natural home or environment for organisms
27. not alive