Paul Nelson writes:
Could Sahotra [Sarkar] provide any experimental evidence, from any vertebrate group, that developmental pathways for whole organ systems (such as the gut) varied as significantly as his selection story requires? No — the usual term for such variation is Ã¢â‚¬Å“embryonic lethal.Ã¢â‚¬Â Faced with data that refute the neo-Darwinian account of homology, Sahotra told a Tall One
No problem for Sahotra, however. Natural selection, he said, simply preserved the adult anatomy — keep a tube — while allowing the developmental pathways to vary. WhereÃ¢â‚¬â„¢s the puzzle? Evolution triumphs again.
The charitable description for that explanation is Ã¢â‚¬Å“ad hoc.Ã¢â‚¬Â The accurate description is the steaming organic matter, suitable for fertilizer, produced by the nethermost regions of a male bovine.