Darwinian theory was unable to explain:

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(D) Darwin's theory of natural selection,while revolutionary,had several limitations. $1$. It could not explain the origin of variations or the mechan

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All of the above

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(D) Darwin's theory of natural selection,while revolutionary,had several limitations. $1$. It could not explain the origin of variations or the mechanism of inheritance (as the work of Mendel was not known at that time). $2$. It failed to explain the significance of small or minute variations that do not provide an immediate survival advantage. $3$. It could not explain the presence of vestigial organs,which are reduced or non-functional in the current organism. $4$. It also could not account for the evolution of over-specialized organs (like the massive antlers of the Irish deer) that might seem detrimental to survival. Therefore,all the given options represent aspects that Darwinian theory could not adequately explain.

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