| A | B |
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| Ecology | - The study of organisms in their homes - The study of relationships of living organsims with other or with their enviroment |
| Enviroment | - The sum of all external conditions and infulences affecting the life, developement, and survival of an individual organsim or population |
| Abiotic Factors | Non-living : Air, Water, Soil |
| Biotic Factors | Living Organisms |
| Habitat | - The specific region in which organisms live |
| Niche | All physical, chemical, biological factors a species needs to survive, stay healthy and reproduce in a ecosystem |
| Population | All the organisms of the same type living in a certain area |
| Community | A group of population living in a given area |
| Species | The major subdivision of a genus, regarded as the basic category of biological classifications, composed of related individuals that resemble one another and are able to breed among themselves |
| Ecosystem | Any area of nature that includes living organisms and non-living substances interacting to produce an exchange of materials b/w the living and non-living parts |
| biosphere (ecosphere) | - Global ecosystem - The sum totalof all the various ecosystems of the Earth |
| Biome | A large ecosystem characterized by a disctinctive type of vegetation and maintained under the climatic condition of the region |
| Biomass | the dry weight of organic material in an ecosystem |
| Decomposer | tiny organisms that breakdown the complex compounds of dead animals or plants |
| omnivore | an animal that can use both plants and other animals as food |
| food chain | sequence of transferring energy in the form of food from one organism to another |
| trophic level | feeding level in ecosystems |
| consumer | organisms that eat other organims |
| scavenger | an organism that feeds on dead organic matter |
| 10% Rule | Only 10% of the energy from a lower trophic level gets conveted to the biomass of the organism directly above it |
