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When considering the biomass of a photosynthetic organism for energy transfer studies, which of the following BEST explains why is it necessary to use the dry mass rather than the wet mass to determine productivity?


The wet mass can vary widely due to differing concentrations of minerals in soil.


The mass that is produced and added to the organism does not include the mass of water.


Water has no caloric value.


Water plays no role in primary productivity.

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