Losing our sense of smell is an example of decay or de-evolution 1, the direct opposite of evolution. Evolution is supposed to explain how the sense of smell arose in the first place, not how it was destroyed. Furthermore, to assume that humans have lost their sense of smell just because other primates have a better sense of smell is just an assumption (guess). It could be just as likely that God created humans with less of a sense of smell, or that the curse on creation has damaged our genes for smell.
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Coyne, J. A. (2009). Why Evolution Is True. New York: Viking.
- Coyne, 2009, p. 71: “But the most striking example of the evolution–or de-evolution–of OR [olfactory receptor] genes is the dolphin.” ↩