Add to the rule Anatomy, as part of the list of valid organ states:

*Bud: An organ in the state of Bud may “split” as an atomic action if there are at least two other organs with the state of Bud, to create a new creature. Name the creature a well established human name unique to the game state, change the creature of each organ in the state of Bud to that name, and change the state of all organs in the state of bud to amorphous

Add to the rule Creatures

If a creature has less than three organs, it ceases to be a creature, and any organs in it must change their state to nymph (for free, without paying any nutrients) before taking any dynastic actions.