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You said "The main aspect in the theory of evolution proposed by Darwin is that any organ is developed to meet a need. "
I understand you are speaking in generalities and that in any discussion of evolution there is necessarily a boiling down of principles otherwise a single point of discussion could go on for hundreds of pages. (I believe this is the reason many people reject evolution for a "simpler" explanation). in any case though I must object to your opening statement. Darwin believed in natural selection and chance. This is not the same as you state. Organs are not developed to meet any need. Nature is constantly tinkering and making changes. If these changes are beneficial then they are passed on. Similarly, organs are not suppressed when no longer needed. Men still have nipples for instance.
Evolution is about chance changed increasing or decreasing survivability.
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