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
each step in a food chain or food web
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