bacteria body cloud

 Just as humans have evolved over millions of years through natural selection, our microbiome has evolved alongside us and perhaps it has done so in a longstanding codependent partnership. 

"discovered 60 microbial strains that, between and within countries, have evolutionary histories in parallel with human phylogenies, indicating codiversification. "

"Reviewed by Emily Henderson, B.Sc.Sep 15 2022. Strains within gut microbial species codiversified with human populations, study finds". Www.News-medical.Net, 2022, https://www.news-medical.net/news/20220915/Strains-within-gut-microbial-species-codiversified-with-human-populations-study-finds.aspx. Accessed 19 Sep 2022.

Where does the human body end? If the microbiomes on our body our codependent, perhaps even symbiotic, than where our skin ends, bacteria begin.  and where do the bacteria surrounding our body end?