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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.
unit 4 ecosystems section 3 energy flow through ecosystems ecosystems maintain themselves by cycling energy and nutrients obtained from external sources at the first trophic level primary producers plants algae and some bacteria use solar energy to produce organic plant material through photosynthesis herbivores animals that feed solely on plants make up the second trophic level