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the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist


(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other


plant capable of synthesizing its own food from simple organic substances


synthesis of carbohydrate from carbon dioxide and water


organism that feeds on plant and animal remains and other dead matter


the total mass of living matter in a given unit area


When a plant releases water into the atmosphere


conversion of nitrates into nitrogen gas


a major biotic community characterized by the dominant forms of plant life and the prevailing climate

Trophic Level

each step in a food chain or food web

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