"Orchids were not made by an ideal engineer; they are jury-rigged from a limited set of available components."
"Forelimbs of people, porpoises, bats and horses provide the classic example of homology in most textbooks. They look different, and do different things, but are built of the same bones. No engineer, starting from scratch each time, would have built such disparate structures from the same parts."
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Source: Stephen Jay Gould (2011). “Leonardo's Mountain of Clams and the Diet of Worms”, p.315, Harvard University Press
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