biological oxygen demand indicator of pollution caused by an effluent. related to the uptake ot dissolved oxygen by microorganisms that decompose organic matter present in the effluent biomass weight of living material. typically expressed as dry weight per unit area or volume biome large regional or subcontinental system characterized by a particular major vegetation ',such as a temperate deciduous forest): biomes are distinguished by the predominant 71ants associated with a particular climate (especially temperature and precipitation) biosphere that part of the environment of Earth in which living organisms are found biotic refers to the living components of an ecosystem biotic potential maximum reproductive potential of an organism bog wetland ecosystem characterized by acidic conditions and accumulation of peat. dominated by sphagnum moss bottom-up regulation regulation of a community or ecosystem trophic structure related to increased
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