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Definition
| a producer. An organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds |
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Definition
| a consumer. An organism that obtains energy from the foods it consumes |
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| group of ecosystems that have the same climate and dominant communities |
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| total amount of living tissue within a given trophic level |
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Definition
| process of converting nitrogen gas into ammonia |
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Definition
| step in a food chain or food web |
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Definition
| symbiotic relationship in which one member of the association benefits and the other is neither helped nor harmed |
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Definition
| full range of physical and biological conditions in which an organism lives and the way in which the organism uses those conditions |
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Definition
| layer of permanently frozen subsoil in the tundra |
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Definition
| first species to populate an area during primary succession |
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Definition
| the series of predictable changes that occur in a community over time |
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| relationship in which two species live closely together |
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| biome in which the winters are cold but summers are mild enough to allow the ground to thaw |
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Definition
| factor that causes the growth of a population to decrease |
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Definition
| movement of individuals into an area occupied by an existing population |
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Definition
| movement of individuals out of an area |
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Definition
| largest number of individuals of a population that a given environment can support |
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Definition
| discipline of classifying organisms and assigning each organism a universally accepted name |
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Definition
| the study of evolutionary relationships among organisms |
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Definition
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Definition
| ability of an organism to survive and reproduce in its environment |
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Definition
| process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest |
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Definition
| structures that have different mature forms in different organisms but develop from the same embryonic tissues |
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