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Gross primary productivity minus respiration losses equals:

ANet primary productivity
BSecondary productivity
CStanding crop biomass
DGross ecosystem output
Answer & Solution
Correct answer: A. Net primary productivity
1. Plants use much of GPP in respiration. 2. GPP minus R gives NPP. 3. NPP is the biomass available to heterotrophs. _Source: syllabus Biology, Chapter 14, Ecosystem._
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