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Caption: Bacteria called rhizobia live inside nodules, small balls attached to the roots of some leguminous plants, such as clover. By synthesizing ammonium ions, they supply the plant with the nitrogen it needs and enrich the soil.
Credit: Album / Universal Images Group
Image size: 2700 × 2700 px | 20.9 MB
Print size: 22.9 × 22.9 cm | 1063.0 × 1063.0 in (300 dpi)