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| physical rather than biological; not derived from living organisms. |
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| relating to or resulting from living things, especially in their ecological relations. |
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| a group of actually or potentially interacting species living in the same place |
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| the struggle between two organisms for the same resources within an environment. |
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| Consumers are unable to make their own energy, and instead rely on the consumption and digestion of producers or other consumers, or both, to survive. |
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| an organism that decomposes, or breaks down, organic material such as the remains of dead organisms |
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| a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. These biotic and abiotic components are linked together through nutrient cycles and energy flows. |
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| the natural interconnection of food chains and a graphical representation (usually an image) of what-eats-what in an ecological community. |
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| an ecological or environmental area that is inhabited by a particular species of animal, plant or other type of organism. |
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| describing the relational position of a species or population in an ecosystem. |
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| symbiotic relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm, and is adapted structurally to this way of life. |
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| A group of organisms of the same species who live in the same area at the same time. |
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| organisms that create food from inorganic matter. |
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| a group of interbreeding organisms that do not ordinarily breed with members of other groups. |
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| a close ecological relationship between the individuals of two (or more) different species. |
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| level is the group of organisms within an ecosystem which occupy the same level in a food chain. |
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