C: Forest A producers have lower rates of cellular respiration than forest B producers.
Net primary productivity is the amount of biomass (organic matter) left over after cellular respiration has been subtracted from gross primary productivity. As Forest A has a higher net primary productivity than Forest B, this suggests that the producers in Forest A have lower rates of cellular respiration than the producers in Forest B.
This means that the producers in Forest A are able to convert more of their gross primary productivity into biomass than the producers in Forest B, resulting in a higher net primary productivity.
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