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Trophic levels are the feeding positions within a food chain.
Each organism occupies a particular trophic level depending upon what it eats and/or what eats it.
Producers - usually green plants - always occupy the first trophic level and this is the level of greatest biomass. Other levels are occupied by consumers.
Energy is lost from the system from level to level, through such processes as growth, respiration, production of faeces etc., so there are usually only three or four levels, in total.
Anne Evans
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