How would a biologically advanced race without technology leave their planet?

I'm making an alien race that's kinda like the Tyranids. My problem right now is that they're starting out on a planet. How would they actually leave this planet using only their biological abilities? Note that I'm designing this race as one that relies on extremely fast evolutionary stages (EX; an adult creature sees a need to survive in a colder climate, so it rapidly evolves itself)

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How would a biologically advanced race without technology leave their planet?

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