Symbiote
From SGCommand
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The term symbiote (or symbiont) refers to a Goa'uld parasite living in some host (usually human). In biology a symbiote is an organism that lives with or off another organism receiving and/or giving benefits. Parasitism (a form of symbiosis in which one organism benefits, and the other is harmed) describes the Goa'uld relationship with their hosts because they feed off of another being without providing true benefits. The Goa'uld are biotrophic which means they rely on their host to survive (the long life and physical healing benefit is provided to the host for the sole purpose of serving the Goa'uld). The Tok'ra, on the other hand, live in a mutualistic symbiosis with their hosts (since both organisms benefit). Both are called endosymbionts, which live inside their hosts. The Symbiote is one of the Goa'uld's main sources of power, because their Jaffa warriors depend on the symbiotes to survive, thus causing the Jaffa to be loyal (most of the time) to their Goa'uld masters.
