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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.
How important are plants (photosynthetic organisms) to living organisms? Photosynthetic organisms produce oxygen that almost all other living organisms need. They are also a major source of food and supply organic compounds that other living organisms need for their survival.