Net primary productivity is

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secondary productivity + respiration

available biomass for herbivores

gross primary productivity + respiration

not available to decomposers

answer is B.

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Detailed Solution

Net primary productivity is the available biomass for the consumption to heterotrophs (herbivores and decomposers).

Gross primary productivity minus respiration losses (R), is the net primary productivity (NPP). GPP – R = NPP.

Secondary productivity (SP) is defined as the rate of formation of new organic matter by consumers.

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