What is the difference between a mutualistic relationship and parasitic relationship?

Question

anonymous · Answer

Mutualistic relationship is when you have two creatures living together in close proximity and benefitting from each other.  A good example is the clown fish and the sea anemone living together.  The territorial clown fish protects the anemone from anemone-eating fish, and in turn the stinging tentacles of the anemone protect the clownfish from its predators. A special mucus on the clownfish protects it from the stinging tentacles.

In a parasitic relationship, two creatures live together but only one benefits from it and the other gets hurt by it, sometimes to even death.  Good examples are ticks, fleas, mosquitoes, and vampire bats.  They all feed off their victims without any benefit to the victim, sometimes killing them with infections and overfeeding.

anonymous · Answer

difference between tok'ra  and goa'uld...

only makes sense if you are a stargate fan,