A recent question asked for a natural mechanism for a creature to escape one planet and go to 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 go to 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. 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.