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Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks:

1. Rock, Detritus, Litter fall, Producers
2. Litter fall, Producers, Rock, Detritus minerals
3. Detritus, Rock, Producer, Litter fall
4. Producers, Litter fall, Rock, Detritus minerals

Correct answer: Rock, Detritus, Litter fall, Producers

Solution

In terrestrial phosphorus cycling, the main long-term reservoir is rock, which weathers to release phosphate. Plants (producers) take it up, and when plant parts die and fall, they become litter fall and then detritus.

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