If only simple microbial life were discovered on another world, which key question about cosmic evolution would remain largely unanswered?

Answer

Whether evolution reliably produces complex or intelligent life.

Finding simple life indicates that the initial step of abiogenesis is relatively easy. However, it leaves open the critical question of whether evolution consistently leads toward multicellularity, tool-use, or intelligence.

If only simple microbial life were discovered on another world, which key question about cosmic evolution would remain largely unanswered?
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