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phosphate(25)
phosphorus(11)
carbon(8)
oxygen(8)
ph(8)
salinity(8)
nitrate(7)
nitrogen(7)
sediments(7)
biomass(6)
lakes(6)
surface water(6)
iron(5)
nutrients(4)
oceans(4)
sodium(4)
absorption(3)
calcium(3)
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