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In Ecosystems. Organisms tend to get phosphorus from their local ecosystem. An  organism can also get nitrogen from its local ecosystem. Nitrogen  is added to the organism's local ecosyste â¦ m by bacteria from the  air.
A.the amount of added nutrient that can be absorbed by plants without damaging ecosystem integrity B.the amount of nutrient augmentation necessary to bring a depleted habitat back to its former level C.the level of a given toxin in an ecosystem that is lethal to 50 percent of the species present D.the number of predators an ecosystem can support that effectively culls prey populations to healthy levels