If a trait would be advantageous to an organism then why hasn't it evolved yet?
Conversely, if a trait is not advantageous or mildly disadvantageous, why does it exist?
In other words why does evolution not make the organism more "perfect"?
This is a general question that would be applicable for any kind of trait. Please keep the answers precise and scientific.
Read this meta post for more information: Questions asking for evolutionary reasons
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