Origen (troll?):
The same Indian friend [...] confirms that even today you can see the evidence in Boas and Pythons that they used to have legs in the ancient past. [....] Genesis 3:14 mentions the curse that God gave to the serpent that the Devil used to deceive Adam and Eve. God literally cursed the genes of the serpent and its younglings would have been born without legs.
So when and why did God curse whales?
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Archer
All species are transitional.