regarding  

 https://en.wikipedia.org/wiki/Human_genome#Evolution: 

 The statement  

 "Humans have undergone an extraordinary loss of olfactory receptor genes during our recent evolution, which explains our relatively crude sense of smell compared to most other mammals. Evolutionary evidence suggests that the emergence of color vision in humans and several other primate species has diminished the need for the sense of smell."  

 is contradicted in  

 https://en.wikipedia.org/wiki/Olfactory_receptor#Evolution