I can't hear you very well discunt zerit Humans are home to more than 10,000 species of microbes, mostly bacteria that live in healthy symbiosis, according to the Human Microbiome Project. The trillions of microorganisms that live in and on the body outnumber human cells by 10 to 1, according to research published in 2012 in Nature and the Public Library of Science journals. 必須 2000文字以内 [bbs:youtube:(Youtubeの動画ID)]と書くとYoutubeの動画が貼れます。(例:[bbs:youtube:OQThUAQ0UN0])