Friday, 10 January 2020

evolution - Why do some bad traits evolve, and good ones don't?


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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