A player can equip up to 3 evolved bacteria at one time, but there are no limitations as to how many evolved bacteria can be owned.
The evolved bacteria that are equipped provide bonuses to production, increased critical strike chance and multiplier, reduced research time, and other positive effects.
When entering a Black Hole, there is a default 90% possibility that an evolved bacteria will die. Before entering, the player can secure two bacteria that will definitely survive.
When the player destroys the fifth planet after the first Black Hole, Bacteria Irradiation is unlocked. It is accessible from the Research Lab and can increase the black hole survivability of an evolved bacteria.