AP Environmental Sciencehardmcq1 pt
An ecosystem's NPP equals zero. What must be true?
A.GPP equals respiration
B.There are no producers
C.GPP is infinite
D.Respiration is zero
Explanation
Core Concept
NPP = GPP − R; zero means producers respire everything they fix, leaving no net biomass for consumers.
Correct Answer
AGPP equals respiration
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