sequences are identifiable. on the other hand, we know very little about the functions. so, it s like we have name tags for a whole lot of people at a party but don t know what they do. what makes this particularly hard is the diversity of microbiomes and that they change every day. each of us is changing them right now three things happen. space we live and work in, people we live and work with. we re all 99.9% identical in terms of the human giee no, ma am. no two are the same. it s unique to each of us. the microbiome is made up of all the microbes in and on the body. viruses for example. most of these live in our gut, primarily in the large intestine. the total surface area is estimated to be 3,000 square feet.