| A | B |
|---|
| Biotic Factors | The living factors in an organism's environment. |
| Biological Community | A group of interacting populations that occupy the same geographic area at the same time. |
| Abiotic Factors | Non living factor's in an organism's environment |
| Biome | A large group of ecosystem's that can share the same climate and have similart types of communities. |
| Biosphere | Portion o fearth that supports life |
| Commensalism | A relationship in which one organism benefits and the other organism is neither helped or harmed. |
| Ecology | The scientific discipline in which the relationships among living organisms and the interacting the organisms have with their environments are studied. |
| Ecosystem | Biological community and all of the abiotic factors that affect it |
| Habitat | An area where an organism lives. |
| Mutualism | The relationship between two or more organisms that live closely together and benefit from each other. |
| Niche | The role or position that an organism has in its environment |
| Parasitism | A symbiotic relationship in which one organism benefits at the expense of another ogranism. |
| Population | Individual organisms of a single species that share the sae geoigraphic location at the same time. |
| Predation | The act of one organism consuming another organism usues a resource at the same time |
| Symbiosis | The close relationship that exists when two or more species live together. |
| Autotroph | An organism that collects energy from sunlight or inorganic substances to produce food. |
| Biomass | The total mass of living matter at each trophic level. |
| Carnivore | Heterotrophs that prey on other heterotrophs. |
| Detrituvore | Eat fragments of dead matter in an ecosystem,return nutrient to the soil,air,and water where the nutrients can be reused by organisms. |
| Food Chain | A simple model that shows how energy flows through an ecosystem. |
| Food Web | A mdoel representing the many interconnected food chains and pathways which energy flows through an ecosystem. |
| Herbivore | A heterotroph that only eat plants |
| Heterotroph | An organism that gets its energy requirements by consuming other organisms, |
| Omnivore | Eat both plants and animals |
| Trophic level | Each step in a food chain or food web. |
| Biogeochemical cycle | Exchange of matter through the biosphere |
| Denitrification | Some oil bacteria conver fixed nitrogen compound back into nitrogen gas which returns it to the atmosphere |
| Matter | Anything that takes up space and has mass. |
| Nitrogen Fixation | The process of caputure and conversion of nitrogen into a form that is useable by plants. |
| Nutrient | A chemical substance that an organism must obbtain from its environment to sustain life and undergo life processes. |
