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Definition
| the study of the interactions of living organisms with one another and with their environment |
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| the place where an organism usually lives |
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| a group of various species that live in the same habitat and interact with each other |
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| a community of organisms and their abiotic environment |
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| an environmental factor that is not associated with the activities of living organisms |
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Definition
| an environmental factor that is associated with or results from the activities of living organisms |
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| the variety of organisms in a given area, the genetic variation within a population, the variety of species in a community, or the variety of communities in an ecosystem |
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| a species that colonizes an uninhabited area and that starts an ecological cycle in which many other species become established |
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| a somewhat regulat progression of species replacement |
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| succession that begins in an area that previously did not support life |
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| the process by which one community replaces another community that has been partially or totally destroyed |
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| the total amount of organic material that the autotrophic organisms of an ecosystem produce |
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| an organism that can make organic molecules from inorganic molecules; a photosynthetic or chemosynthetic autotroph that serves as the basic food source in an ecosystem |
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| consumer- an organism that eats other organisms or organic matter instead of producing its own nutrients or obtaining nutrients from inorganic sources |
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Definition
| an organism that eats other organisms or organic matter instead of producing its own nutrients or obtaining nutrients from inorganic sources |
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Definition
| one of the steps in a food chain or food pyramid; examples include producers and primary, secondary, and tertiary consumers |
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Definition
| the path of energy through the trophic levels of an ecosystem |
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Definition
| animals that eat plants or other primary producers |
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Definition
| animals that eat other animals |
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Definition
| animals that are both carnivores and herbivores |
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Definition
| a diagram in which each trophic level is represented by a block, and the blocks are stacked on top of one another, with the lowest trophic level on the bottom |
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| the paths of water, carbon, nitrogen, and phosphorus when they form closed circles |
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| water that is retained beneath the surface of the earth |
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Definition
| when water moves into the atmosphere by evaporating from the leaves |
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Definition
| the process of combining nitrogen with hydrogen to form ammonia |
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