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This evolution is one of the three that were introduced to Kassidor between twenty five and fifty thousand years ago. There are four Macroscopic phyla in two kingdoms. They are characterized by three nucleotides coding for each ammino acid. They have evolved complex cells, and are characterized by cells that include primitive cells within them which have become intra-cellular symbionts.
Only one vertibrate species was brought to Kassidor, humans. We will not recap human biology and physiology here.
It appears that several parasitic forms of flatworms were brought to the planet, probably within a human gut. They have no other hosts on the planet and have largely been eradicated. One species, the kvarit, has been genetically engineered to consume human waste and is widely used in wastewater treatment and as a food source.
Some roundworms must have come as human parasites but some were able to live in the soil where they compete with the dtairs and klinoids. At least four species have evolved. Those parasitic to humans have been eradicated.
The onion was probably brought to Kassidor to allow humans to survive because it produces an essential amino acid in abundance that is not found in the native biosphere. The means to produce this amino acid has been engineered into other plants since the Energy Age. The ability to survive frost has been engineered into onions since the middle kingdom of Egypt. The means to produce the amino acid in the body has been available since the early modern age.
Before that time the range of humans was restricted to areas where frost was not likely or dried onion could be imported. In spite of the fact that it is no longer strictly necessary, it is so ingrained in the culture that almost no one will go a day without it if they live in a climate where it can possibly grow.
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