This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
animal insect These little spheres covering the roots of this soybean plant contain billions of rhizobia bacteria which convert nitrogen from the air into ammonium These little spheres covering the roots of this soybean plant contain billions of rhizobia bacteria which convert nitrogen from the air into ammonium