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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.
Soil organisms are responsible, to a varying degree depending on the system, for performing vital functions in the soil. Soil organisms make up the diversity of life in the soil (Figure A1.1). This soil biodiversity is an important but poorly understood component of terrestrial ecosystems.