Unit 9

3. a hierarchical series of organisms each dependent on the next as a source of food.
6. a system of interlocking and interdependent food chains.
8. the build up of chemicals in fish.
9. an animal or person that eats food of both plant and animal origin.
10. a species' average population size in a particular habitat.
13. an animal that feeds on plants.
14. an association between two organisms in which one benefits and the other derives neither benefit nor harm.
18. can result in many serious alterations to the environment, eventually impacting human health.
20. a living organism that shapes its environment.
23. a non-native species whose introduc- tion does or is likely to cause economic or environmental harm or harm to human, animal, or plant health.
24. a type of symbiotic relationship where all species involved benefit from their interactions.
25. the practice of living as a parasite in or on another organism.
26. a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life.

1. an animal that feeds on flesh.
2. Living things that have to hunt, gather and eat their food
4. a non-living part of an ecosystem that shapes its environment.
5. nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine.
7. the purposeful clearing of forested land.
11. any concentration of a toxin, such as pesticides, in the tissues of tolerant species at increasingly higher levels in a food chain.
12. an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material.
15. a group of organisms that can reproduce with one another in nature and produce fertile offspring.
16. a species of animal or plant that is seriously at risk of extinction.
17. the position of an organism in the food chain
19. a group of individuals of the same species living and interbreeding within a given area.
21. any kind of green plant
22. an interacting group of various species in a shared/ common location.