(B) In the phosphorus cycle, the primary reservoir is the Earth's crust. Weathering of rocks releases phosphate ions into the soil solution. These pho

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(B) In the phosphorus cycle, the primary reservoir is the Earth's crust. Weathering of rocks releases phosphate ions into the soil solution. These phosphate ions are then absorbed by plants, which are the $Producers$ in the ecosystem. Therefore, phosphate becomes available to producers first.