Thread:ThunderStar321/@comment-35283648-20180412022122/@comment-26434953-20180412175156

The Sea Emperor species died because while they were immune to Kharaa, their primary food source was not. The lack of food resulted in the species’ extinction except for the one in containment, and the aforementioned Sea Emperor survived because of the environment it was in, which also contributed to it far surpassing its lifespan.

The babies grew up so fast because the of lore reasons, it has nothing to do with the food source.