Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks $(A-D)$. Identify the blanks.
- A$A$-Rock minerals,$B$-Detritus,$C$-Litter fall,$D$-Producers
- B$A$-Litter fall,$B$-Producers,$C$-Rock minerals,$D$-Detritus
- C$A$-Detritus,$B$-Rock minerals,$C$-Producers,$D$-Litter fall
- D$A$-Producers,$B$-Litter fall,$C$-Rock minerals,$D$-Detritus
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