AP Environmental Science Quiz
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THE LIVING WORLD: ECOSYSTEMS
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A lake receives phosphorus from two main sources: (1) natural weathering of phosphate-bearing rock in the watershed and (2) runoff from lawns treated with fertilizer. In the lake, algae incorporate phosphate into biomass; when algae die, decomposition releases phosphate back into the water and sediments. Which statement best identifies the primary long-term natural source of phosphorus entering most ecosystems?
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