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Wat
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A trait doesn't have to be helpful for survival. It just has to not be detrimental. >

Not only that, but detrimental traits can also persist if the mutations to combat them have never appeared, or if an individual is generally able to reproduce before their appearance, or if individual genes that cause the trait are beneficial when combined differently, are present in the opposite sex, etc. There are many factors. >

exactly, a living proof is the Babirusa! >

That's the boar with the teeth that pierces their own skull, right?