Yeah, im leaning towards a more healing side this turn...
Also, multi-cellular organisms (is different than just cell division) will allow you to become much larger and advance to the next stage.
Cell size can only go up to 10, basically like every ability, excluding a few special ones, your cell can not grow bigger than that unless you get the ability of cell wall and large vacuole, even then its not worth it unless your planning on becoming a plant like creature...
Multi-cellular organisms is the other way to get bigger and much more complex creatures, you can control more of an organism with multi-cellular organisms, especially in later stages where you have a brain...
The brain can not be developed yet in this stage at all and can only be developed later on, past multi-cellular stage...
Having a brain allows you to do much more things than before rather than relying simply on instinct...
Certain skills have levels in them, and may change in certain stages.
E.g.
Parasitism in cell stage will change to "basic parasitism" in creature stage, it will also have three stages of parasitism, basic, normal, and advanced.
Certain skills branch off into other skills, and can only be available as long as you reach the skill requirement...