Which of the following elements often limits the primary productivity of an ecosystem?

  • A
    Carbon
  • B
    Nitrogen
  • C
    Phosphorus
  • D
    Sulphur

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$A.$ Tropical deciduous forest
$B.$ Temperate coniferous forest
$C.$ Tropical rain forest
$D.$ Temperate deciduous forest

In the equation $GPP - R = NPP$,what does $R$ represent?

$NPP =$

The energy or biomass remaining after heterotrophic respiration is called ..........?

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