Shifting the burden of proof onto their critics is a common approach among partisans of [[evolutionism]], for example, [[Darwin]] stated in 1937: ''“…why to be sure there were a thousand intermediate forms. — Opponent will say. Show them me. I will answer yes, if you will show me every step between bulldog and greyhound.”''<ref>{{cite web
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Shifting the burden of proof onto their critics is a common approach among partisans of [[evolutionism]], for example, [[Darwin]] stated in 1837: ''“…why to be sure there were a thousand intermediate forms. — Opponent will say. Show them me. I will answer yes, if you will show me every step between bulldog and greyhound.”''<ref name="Hedtke"/><ref>{{cite web
|author=Darwin, C. R.
|author=Darwin, C. R.
|title=Notebook B: [Transmutation of species (1837-1838)]
|title=Notebook B: [Transmutation of species (1837-1838)]