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| A group of verious 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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| A place where an organsim usually lives |
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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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| The replacement of one type of community by another at a single location over a period of time |
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| The average weather conditions in an area over a long period of time |
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| A large region characterized by a specific type of climate and certain types of plant and animal communities |
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| A photosynthetic or chemosynthetic autotroph that serves as the basic food source in an ecosystem |
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| 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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| An organic that feeds by breaking down organic matter from dead organisms |
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| One of the steps in a food chain or food pyramid |
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| A triangular diagram that shows an ecosystem's loss of energy,which results as energy passes through the ecosystem's food chain |
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| The movement of carbon from the nonliving environment into living things and back |
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| The exchange of oxygen and carbon dioxide between living cells and their environment. |
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| The cycling of nirtogen between organisms, soil, water, and the atmosphere. |
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| The cyclic movement of phosphorus in different chemical forms from the environment to organisms and then back to the environment |
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