The digits (fingers and/or toes)of humans are seemingly derived from those of early fish and tetrapods. Though, these creatures most likely could not walk on land, only on the ocean floor and in shallow water. Digits could, in theory, be modified during their initial growth, as evidence shows that this is what happens during evolution. Therefore, (once again theoretically,) it should be possible to modify digits of creatures, giving them the characteristics of their ancestors. In other words, reverse evolution. All of this does (mostly) make sense to me, and seems reasonably fool-proof, though it has not yet been performed.
Pages 160-180
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