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This flowchart is a simplified model of Phosphorous cycle. Identify labeling A and B.

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The correct answer is:
A: Producers
B: Weathering
B: Weathering
This is a terrestrial ecosystem as it begins with rocks. Phosphorus is present in rocs as phosphates. When they weather, a small amount of phosphates dissolve in soil and reach the plants. They are absorbed by the roots of the plants. Animals will feed on plants and obtain phosphorus. When plants and animals die they are decomposed by bacteria releasing phosphorus.
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