Endosymbiosis
Utankärna have been integrated into the biology of most clades of Medkärna. On Earth, this is thought to have occurred three times. The same will be true on Sighsten. First were the Sakätare who intergrated a Utankärna into their biology. The Utankärna would specialize in releasing energy from organic compounds, like the mitochondria on Earth. Secondly, came the Solätare who possess a Grönutankärna. The Grönutankärna gives their host energy-rich sugars in return for protection and resources. In other words, Sighsten's analogy to Earth's chloroplasts. Lastly, were Utankärna that would specialize in binding Nitrogen, a vital element for all life, to be used by their Medkärna hosts.
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