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| parts of the Earth in which life exists (including land, water and the atmosphere) |
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| the scientific study of interactions among organisms and between organisms and their physical environment |
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| Any living part of the environment with which an organism might interact, including animals, plants, fungi, and bacteria |
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| any non-living part of the environment that an organism might interact with, such as sunlight, heat, precipitation, humidity, wind, or the water currents, and soil type. |
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| are the first producers of energy-rich compounds that are later used by other organisms (autotroph). Organisms that photosynthesize or organisms that carry out chemosynthesis (chemical energy is used to produce carbohydrates). |
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| a series of steps in which organisms transfer energy by eating and being eaten. |
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| network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem. |
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| Each step in a food chain or food web. |
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| organisms that rely on other organisms for energy and nutrients |
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| Organism that feeds on plants and animal remains and other dead matter. |
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| an ecosystem that occupies a geographical area and is characterized by a specific type of plant community |
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| many different populations that live in a area together at the same time. |
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| where an organism lives and what it does in its environment |
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| a place where an organism lives |
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| a relationship between two organisms living in the same place. |
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| a symbiotic relationship where both organisms benefit |
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| a symbiotic relationship where only one organism benefits by living in or on another and gains nutrients. |
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| a symbiotic relationship where one organism benefits where the other neither benefits or is harmed. |
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| An ecosystem change over a period of time. |
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| A wetland that contains a mixture of fresh water and salt water. |
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| an animal that kills and eats other animals |
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| organisms that are killed and eaten by another organism. |
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| all organisms and their nonliving environments within a defined area. |
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| Interspecific competition |
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Definition
| competition among individuals or different species |
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| Intraspecific competition |
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| Competition among individuals of the same species |
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| a structural change in a community and its non-living environment over time. The gradual replacement of species in an area over time. |
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| Succession that occurs in an environment in which no trace of a previous community is present. |
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| succession that occurs after an existing community is disturbed (such as a forest fire). |
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| a diverse and relatively stable community that forms the endpoint of succession. |
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| a close interaction between organisms of different species over an extended period of time. Either or both species may benefit from the association or one species could be harmed. |
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| interaction among individuals who attempt to use the same resources |
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