>>16710192one example isnt enough to determine probability
also multicellularity required that the solar system to stabilize before it formed, before then meteor strikes would constantly reset any progress
venus and mars are examples of what happens when a planet doesn't have a large moon and wasn't hit by another large proto plant warming its core
both very likely had some kind of single cellular life bet it never progressed past that because multicellularity requires way more to go right for it to survive long