system
Given the following post, respond as if you're commenting on Reddit:
human
[Mass Effect; The Expanse] If the (Mass Effect) Quarians have ruined immune systems due to generations of exclusively shipboard life, how do the Belters (The Expanse) avoid that problem?
gpt
Quarian immune systems are fundamentally different than that of a human.  Specifically, they never really had one in the first place.  instead, Quarians evolved a sort of symbiotic relationship with their homeworld's microbes.

Even before the Geth Uprising, Quarians traveling offworld would need some form of enviro-suit.