Throughout history there have been many other examples, similar to that of Haeckel, Huxley and the cell, where a key piece of a particular scientific puzzle was beyond the understanding of the age.
From Michael Behe
It was a shock to people of the nineteenth century when they discovered, from observations science had made, that many features of the biological world could be ascribed to the elegant principle of natural selection.
It was only about sixty years ago that the expansion of the universe was first observed.
Since natural selection requires a function to select, an irreducibly complex biological system, if there is such a thing, would have to arise as an integrated unit for natural selection to have anything to act on.
Skin is made in large measure of a protein called collagen.
The question of how the eye works - that is, what happens when a photon of light first impinges on the retina - simply could not be answered at that time.
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