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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.
Bacteria play an important role in the global ecosystem in the water and out on land as the cycle of nutrients (carbon, nitrogen, and sulfur) is completed with their work. The â¦ y decompose dead plants and animals as well as animal waste which is helpful because it gets rid of the waste and releases the nutrients back into the environment.