$A$ simplified model of phosphorus cycling in a terrestrial ecosystem is given below. Identify $A, B, C$ and $D$.

  • A
    $A-$Weathering,$B-$Decomposition,$C-$Consumer,$D-$Soil
  • B
    $A-$Decomposition,$B-$Weathering,$C-$Producer,$D-$Soil
  • C
    $A-$Weathering,$B-$Decomposition,$C-$Decomposer,$D-$Soil
  • D
    $A-$Decomposition,$B-$Decomposer,$C-$Weathering,$D-$Soil

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