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> Over geological time period, the zone is likely to suffer unpredictable and novel variability

Earth does that too, though. Ice ages, the odd large impact, etc.

I meant far more frequently than on Earth, and far more extreme.

"Life finds a way" - but if the temperature suddenly jumps 100 degrees because your goldilocks zone librated into the sun, then you ain't got much capacity to evolve protection from that.

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