A reset question asked for a natural mechanism for a creature to escape one planet and goto another. The answers prompted me to this question.
Given any answer to this, is there any plausible case for evolution to enable a creature to leave a planets biosphere and goto another, not by begin blasted from the surface by a meteorite or titanic volcanic explosion, or genetic engineering. I suppose in other words; is naturally evolved [panspermia][1]. possible?
My guess is no, but cannot help but think there may be perhaps some cyclic devastating conditions that eventually leads to this possibility. "Life finds a way."
I would prefer the creature be multicellular. But would accept answers for spores or seeds type transmission.
[1]: https://en.wikipedia.org/wiki/Panspermia#:~:text=Panspermia%20(from%20Ancient%20Greek%20%CF%80%E1%BE%B6%CE%BD,well%20as%20by%20spacecraft%20carrying