The kicker is this Chyeahh - the definition of a species is that it can FURTILE offspring, so successful reproduction is key and the success of that offspring is defined as a species fitness. The liger can not reproduce, just like a mule can not. It seems some safe guards still are at work. These can not be circumvented bc biology is determined through the passage of dna, which in the cases u cited are not successful.
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FFC>FCC
A. bove T. he R. est
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