Ecology

2. an organism that helps define an entire ecosystem
4. rivalry
5. An invasive species is an introduced species to an environment that becomes overpopulated and harms its new environment
6. the process by which energy is relocated from one system to another,
9. An ecological pyramid is a graphical representation designed to show the biomass or bioproductivity at each trophic level in an ecosystem
10. the position of an organism in the food chain
12. A consists of all the food chains in a single ecosystem
13. community of interacting organisms and their physical environment.
18. A limiting factor is a variable of a system that causes a noticeable change in output or another measure of a type of system.
19. the number of people, other living organisms, or crops that a region can support without environmental degradation.
20. an animal that is caught and killed by another for food.

1. are organisms that break down dead or decaying organisms;
3. the variety of life on Earth, in all its forms, from genes and bacteria to entire ecosystems
7. an animal that naturally preys on others.
8. the process of becoming less sensitive to a stimulus after repeated exposure.
11. the natural tendency that a person or animal has to behave or react in a particular way.
14. a person or thing that eats or uses something.
15. natural home or environment of an animal, plant, or other organism.
16. organic matter used as a fuel, especially in a power station for the generation of electricity.
17. when energy is passed in an ecosystem from one trophic level to the next, only ten percent of the energy will be passed on