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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.
Quick Answer. For many ecosystems, the sun provides the primary source of energy. The sun provides light and fuel necessary for the growth of many living organisms, ranging from tiny microbes and bacteria to plants and animals. Some species, primarily photosynthetic plants, use sunlight for creating energy of their own, which in turn helps them grow and reproduce.