This is something that I know absolutely nothing about apart from that it is to do with smell and sensing odours! Hopefully someone else will be able to answer your question better than me!
About the only thing I know about biology is that most humans have two arms, two legs and a head! Sorry, but biology is one subject that my all boys grammar school did not teach. It was, however, taught at the all girls grammar school, such was the sexist nature of education in those days.
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