Biology Chapter 3

4. study of interrelationships between organisms and their relation to their physical surroundings
7. sum of all habitable ecosystems on the earth
9. measurement of the variety of life in a particular ecosystem
10. symbiotic relationship in which two organisms share the same habitat without directly affecting the other
12. living or derived from living things
13. small particle of dead organic material
15. symbiotic relationship between two organisms in which one benefits at the expense of the other
18. organism that breaks down dead organic material, recycling nutrients to be used by other organisms
19. group of organisms of the same species living and interacting within the same geographic area
20. role of an organism within its habitat
21. interaction between two different organisms within an ecosystem

1. nutritional relationships between populations in an ecosystem involving overlapping food chains
2. conflict that results when organism attempt to use the same resources
3. community of organisms in a particular area along with the physical characteristics of their environment
5. set of plants and animals that are adapted for life in those parts of Earth characterized by a particular climate
6. symbiotic relationship between two organisms that is injurious to one without affecting the other
8. changes in the plant and animal communities within a biome due to changes in elevation that produce differences in light, precipitation, and temperature
11. heterotrophic organism, one that can not produce its own food and must obtain energy by consuming other organisms
14. symbiotic relationship between two organisms that benefits one without helping or harming the other
15. autotroph organism, one that can produce its own food from light or chemical energy
16. nonliving
17. symbiotic relationship between two organisms that benefits both organisms