Symbiotic anti-virus animal
An organism lives and reproduces inside the body of other animals. This organism pays back its host by protecting the DNA from viruses and radiation damage in 100% of all cases. The organism itself is also immune to viruses, bacteria and parasites.
Additionally, it boosts the immune system, supports the gut flora, and decreases cholesterol.
As a side effect it causes some spots to appear on the shoulders and backs of its hosts. Usually the spots are from green to bluish and in rare occasions yellow.
This symbiotic organism also attaches to fetuses in the womb or eggs.
How would such an organism evolve?
What can explain the colored spots on the host?
This post was sourced from https://worldbuilding.stackexchange.com/q/51605. It is licensed under CC BY-SA 3.0.
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