Not every species in Star Trek comes from the same biome or even atmosphere. So how do these people work together in the same environment? Well, thankfully Starfleet and the Federation try to acclimatise as many different species as possible with the Standard M class environment.
Starfleet Life-Support
Starfleet Life-Support
"Bible, Wrath of Khan, what's the difference?"
Stan - South Park
Stan - South Park