Mammalian blood clotting requires a precise, complex chain reaction 1 which could not have evolved slowly over time.
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Coyne, J. A. (2009). Why Evolution Is True. New York: Viking.
- Coyne, 2009, p. 139: “Altogether [for blood-clotting pathways for vertebrates] more than twenty proteisn are involved. How could this possibly have evolved? … We don’t know for sure, but we have evidence that the system could have been built up in an adaptive way from simpler precursors.” ↩