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Biological production

the capture of Usable energy from the environment to produce organic compounds in which that energy is stored


Total amount of organic Matter on earth or in any ecosystem or area


Self nourishing

Primary production

Production by autotrophs


Producing sugar from sunlight, carbon dioxide, and water


Organism deriving energy from inorganic sulfur compounds


Organisms that must feed on other living things

Secondary production

Production by heterotrophs


the metabolic processes whereby certain organisms obtain energy from organic molecules

Gross production

Product of organic matter before use

Net production

gross production - respiration

Ecosystem energy flow

movement of energy through an ecosystem from the external environment through a series of organisms and back to external environment.

Thermodynamic system

Energy source and energy sink combined.

Tropic-level efficiency

Ratio of production of one tropic level to the production of the next tropic level


(communication theory) a numerical measure of the uncertainty of an outcome

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