unit 2

2. an introduced, nonnative organism (disease, parasite, plant, or animal) that begins to spread or expand its range from the site of its original introduction and that has the potential to cause harm to the environment, the economy, or to human health
6. the complex of physical, chemical, and biotic factors that act upon an organism or an ecological community and ultimately determine its form and survival
7. A biotic factor is a living organism that shapes its environment
9. the area and resources used by a particular species
10. organism often a microorganism or a plant that serves as a measure of the environmental conditions that exist in a given locale
13. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
14. an interacting group of various species in a common location
15. the interaction of individuals that vie for a common resource that is in limited supply
16. the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
18. an organism that helps define an entire ecosystem
20. an organism that can produce its own food using light, water, carbon dioxide, or other chemicals

1. an organism that consumes other organisms in a food chain
3. any relationship or interaction between two dissimilar organisms.
4. non-living chemical and physical parts of the environment that affect living
5. the role an organism plays in a communityan interacting group of various species in a common location
8. the killing by one living organism of another for food
11. an organism (such as an earthworm or a fungus) that feeds on dead and decomposing organic matter.
12. step in a nutritive series, or food chain, of an ecosystem
17. a living thing made up of one or more cells and able to carry on the activities of life
19. a biological community of interacting organisms and their physical environment