Ecology

4. climatically and geographically defined as contiguous areas with similar climatic conditions on the Earth
6. symbiosis in which one organism lives as a parasite in or on another organism
8. a connection of many food chains
9. interaction between organisms or species, in which the fitness of one is lowered by the presence of another
12. any non-living organism in an environment
13. produced, occurring, or existing within a species or between individuals of a single specie
17. study of interactions among organisms and their environment

1. a linear sequence of links in a food web starting from "producer" species and ending at apex predator species or decomposer species.
2. interaction between two different organisms living in close physical association
3. summation of all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding
5. association between two organisms in which one benefits and the other derives neither benefit nor harm
7. death rate
10. type of biome where the tree growth is hindered by low temperatures and short growing seasons.
11. a form of symbiosis where both organisms benefit
14. birth rate
15. community of living organisms in conjunction with the nonliving components of their environment, interacting as a system.
16. any living organism in an environment