Kane how is co-evolution of symbiotic prokaryotes with eukaryotes similar and different to co-evolution in parasite-host systems?

How co-evolution of symbiotic prokaryotes with eukaryotes similar and different to co-evolution in parasite-host systems is that co existing has provided a sense of advantage with in the environment. One example of this are the parasites. There are different kinds of symbiotic relationships and this shows how similar and different co-evolution is. Hope this helps.