I presume you mean - if evolution is random then there would be lots of unviable species.
Evolution is not random, it is driven by natural selection which is a non random process.
Unviable species can not flourish because they would be selected against because they are unviable.
However, most species become unviable eventually - 98% of species to have ever lived are now extinct.
Why would an intelligent designer produce species that so readily go extinct?
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