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involving interaction between two different organisms living in close physical association.

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a number of people or things sharing a specified characteristic and following one after the other.

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Producers are living things that can make their own food using air, light, soil, and water.

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an animal that is hunted and killed by another for food

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an animal that naturally preys on others.

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all the inhabitants of a particular town, area, or country.

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the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.

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The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems.

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the natural home or environment of an animal, plant, or other organism.

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Fish Ecology Division, Northwest Fisheries Science Center

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We strive to help resource managers and the public understand ecological links between fishes and their Pacific Northwest habitats. We investigate influences on the growth, distribution, and survival of species such as Pacific salmon, hake, and lamprey. We assist management agencies in evaluating stream, river, and watershed restoration projects to recover stocks listed under the U.S.

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A food web consists of all the food chains in a single ecosystem.

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a hierarchical series of organisms each dependent on the next as a source of food.

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An energy pyramid (sometimes called a trophic pyramid or an ecological pyramid) is a graphical representation, showing the flow of energy at each trophic level in an ecosystem.

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a biological community of interacting organisms and their physical environment.

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Deforestation is the permanent removal of trees to make room for something besides forest.

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an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material.

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a person or thing that eats or uses something.

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a group of people living in the same place or having a particular characteristic in common

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involving the incorporation of carbon dioxide into living tissue

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relating to or resulting from living things, especially in their ecological relations.

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the regions of the surface, atmosphere, and hydrosphere of the earth

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a large naturally occurring community of flora and fauna occupying a major habitat

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the variety of life in the world or in a particular habitat or ecosystem.

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the action or process of adapting or being adapted.