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But then this is also an argument against spontaneous emergence of life, right? Sicne mirror-life could just emerge on its own, instead of evolving from regular life.

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Even if the timescales and environments conducive to the emergence of basic life exist on Earth today, I would expect any spontaneously-emerged proto-cell to almost immediately get eaten by normal microorganisms without any meaningful chance to proliferate. Reverse-chirality or no, it'd be a glorified bag of nutrients compared to the more evolved flora surrounding it.

Not necessarily. A pre-condition for emergence and evolution towards more complex life forms can be removed from the system by the existing complex life forms.

At the end of the day, all life is competing for energy. Spontaneous self replicators would be uncompetitive with existing biology and would never make it to more complex stages.

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