These are #root #nodules in a #legume plant. Housed within the nodules are countless #Rhizobia, #bacteria that can convert #nitrogen #gas from the #atmosphere into #ammonia, which is then used by the #plant in the formation of #amino acids and #proteins to grow. In return, the plant provides #organic acids as a #food #source.⠀⠀⠀ ⠀⠀⠀ This #symbiosis evolved over 65 million years and is vital to the #survival of #life on our #planet.