ecology part 1

2. variable of a system that causes a noticeable change in output or another measure of a type of system
4. an innate, typically fixed pattern of behavior in animals in response to certain stimuli
6. an animal that naturally preys on others
8. the variety of life in the world or in a particular habitat or ecosystem
9. a biological community of interacting organisms and their physical environment
11. non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems
13. a living organism that shapes its environment
15. the total mass of organisms in a given area or volume
17. a system of interlocking and interdependent food chains
18. the natural home or environment of an animal, plant, or other organism
20. any kind of green plant

1. the conversion of one form of energy into another, or the movement of energy from one place to another
3. a graphical representation designed to show the biomass or bioproductivity at each trophic level in a given ecosystem
5. the number of people, other living organisms, or crops that a region can support without environmental degradation
7. an animal that is hunted and killed by another for food
10. an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material
12. any organism that can't make its own food
14. a hierarchical series of organisms each dependent on the next as a source of food
16. the position an organism occupies in a food web
19. the activity or condition of competing