Ecology Part 1

4. the mass or weight of living tissue
5. an animal that naturally preys on others
8. an animal that is caught and killed by another for food.
9. the visible features of an area of land
10. the North American bison
11. animals or plants from another region of the world that don't belong in their new environment.
15. make up the second trophic level
17. takes place when energy moves from one place to another
18. the biological variation that occurs within species
19. the world's second-largest and second-most populous continent
20. the natural home or environment of an animal, plant, or other organism

1. organisms that break down dead or decaying organisms
2. a system of interlocking and interdependent food chains.
3. interaction between organisms or species in which both require a resource that is in limited supply.
6. factor a non-living part of an ecosystem that shapes its environment.
7. occurs when animals are exposed to the same stimuli repeatedly, and eventually stop responding to that stimulus
12. a geographical region in Africa
13. a biological community of interacting organisms and their physical environment.
14. the variety of life in the world or in a particular habitat or ecosystem
16. goal-directed and innate patterns of behavior that are not the result of learning or experience.