Your Ability to Smell is One of the Most Complex Abilities You Possess

The blueprint of the human body is considered by all of science to be the human genome. In the genome, the more genes that are associated with a function, the more the complex and biologically import is that function. 

#1 is the Immune System

#2 is Smell

Interestingly, and shocking to everyone back in the early 2000’s when the results of the Human Genome Project was announced, Smell was more important than even reproduction, sight, etc.  Through important research, now we understand why.