Sounds like the novel Parasite Eve which inspired a movie and later videogame series. Basically it piggy backs on the concept of Mitochondrial Eve wherein Mitocondria evolved separately from all other cellular life and exists as a symbiotic organism.
Sounds like the novel Parasite Eve which inspired a movie and later videogame series. Basically it piggy backs on the concept of Mitochondrial Eve wherein Mitocondria evolved separately from all other cellular life and exists as a symbiotic organism.