Chapter 2 Principles of Ecology Section 1 Organisms and Their Relationships
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1. Ecology: is the study of the interactions between organisms and their environments
2. Biosphere: is the portion of Earth that supports life
3. Biotic factors: are the living factors in an organism's environment
4. Abiotic factors: the nonliving factors in an organism's environment
5. Population: individual organisms of the same species living in the same geographic location at the same time
6. Biological community: is a group of populations that interact in the same
geographic area at the same time
7. Ecosystem: is a biological community and all the abiotic factors that affect it
8. Biome: is a large group of ecosystems that share the same climate and have
similar types of biological communities
9. Habitat: is an area where an organism lives
10. Niche: is the role an organism has in its environment
11. Predation: the act of one organism consuming another organism for food
12. Symbiosis: a relationship in which two organisms live together in close association
13. Mutualism: a relationship between two species that live together and benefit
from each other
14. Commensalism: a relationship in which one organism is helped and the other
organism is not harmed or helped
15. Parasitism: a relationship in which one organism benefits and another organism is harmed
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