In a being? I thought it was populations that evolved, not individuals. To the point where individual have to be sacrificed for the benefit of the population or the community.
It is populations that evolve. Natural selection will prevent deleterious features from spreading through the population. That is why it is strange to see creationists claim that evolution will produce non-functioning species. They point to a fossil species and proclaim, "see, it is fully functioning" as if evolution would not produce a fully functioning species.
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