Most lesser ground-based Zerg breathe. Zzgashi Dune Runners breathed, and thus Zerglings likely breathe. In the same way, Mantis Screamers could already traverse the vacuum of space, and thus so can Mutalisks.
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The pre-assimilated species would have needed to breathe.
However, the zerg did transfer a lot of genetics between species. They could have transferred the ability to "not breathe". We don't really know. (Examples: All zerg with overlord-style carapaces, spore colonies with antennae, etc.)
The most parsimonious explanation, though, is they wouldn't have been given the ability to breathe. (In space, they're usually sleeping inside an overlord or behemoth.) But I don't think we can say that for sure.
Perhaps they could turn the genes on or off whenever the need arises. Otherwise, while they do have a lot of genetic dispositions, I don't think it would be efficient to turn them all on. Much like they probably have genes stored to allow a Zergling to breathe underwater, but keep it off as adding gill-like structures would slow down or obstruct some other mechanism.
So, if somehow the atmosphere became barren, a hatchery may easily switch to low oxygen requiring zerglings, but those zerglings might be weaker since they can't use swathes of oxygen to power their muscles. And using these same lings for when the air is breathable would be like equipping a land-based soldier with an oxygen tank.
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We know that the Zerg gave the ability to exist in a vacuum to all of their warriors once:
I think we have to assume that every Zerg automatically gets the ability to survive in space once incorporated into the Swarm. Also, in the StarCraft "The Dream" cinematic, we see that Hydralisk floating in what looks like stellar gas.Quote:
The inclusion of super-dense hides and the ability to exist in a vacuum bolstered the genetic pool of the swarm. Soon the Zerg warriors were conditioned to survive the harshness of space.