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Selection is obviously king, but there seems to be room in the court for Lamarckism, too. Interestingly, it is easy to imagine how Lamarckian evolution could arise as a result of natural selection. This type of evolution has much subtler effects than selection for mutations, but it also works orders of magnitude faster. Maybe there was selective pressure on organisms to adapt quickly to changing environmental conditions. There's a mindfuck. Of course its also possible that the two are completely independent. One can dream.