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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.
Role of Plants in the Ecosystem. Organisms are grouped into producers or consumers. Ecosystems study the flow of energy through it. Energy from sun usually enters the ecosystem through the plants or producers. Producers convert energy from the environment into sugar or glucose. Plants are the most important producers; plants use energy from sunlight to convert carbon dioxide into glucose (or other sugars). Algae and cyanobacteria are producers, like plants that produce food through photosynthesis. Bacteria living around deep-sea vents are the other producers.