Ecology

2. a form of symbiosis where both organisms benefit
4. a connection of many food chains
6. interaction between two different organisms living in close physical association
8. produced, occurring, or existing within a species or between individuals of a single specie
10. community of living organisms in conjunction with the nonliving components of their environment, interacting as a system.
11. any living organism in an environment
12. symbiosis in which one organism lives as a parasite in or on another organism
15. type of biome where the tree growth is hindered by low temperatures and short growing seasons.
16. summation of all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding
17. birth rate

1. association between two organisms in which one benefits and the other derives neither benefit nor harm
3. a linear sequence of links in a food web starting from "producer" species and ending at apex predator species or decomposer species.
5. climatically and geographically defined as contiguous areas with similar climatic conditions on the Earth
7. any non-living organism in an environment
9. interaction between organisms or species, in which the fitness of one is lowered by the presence of another
13. study of interactions among organisms and their environment
14. death rate