We have a thousand genes involved in nasal reception

We have a thousand genes involved in nasal reception, but over half of them have become inactivated due to mutations. In wild apes, only around 30 percent of the smell genes are dysfunctional. Presumably, the mutations persist in humans because losing some smell ability no longer affects our survival.

The Nature Fix: Why Nature Makes Us Happier, Healthier, and More Creative by Florence Williams

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