Bacteria that live in this place, the most diverse part of the microbiota, are called flora, and form a signalling axis with the brain.
Russell Schaedler names a group of eight common bacterial species that live in this habitat. Model species found in this habitat include  theta·iota·omicron  and  fragilis  from the  Bacteroides  genus. Barry Marshall won a Nobel Prize essentially for drinking a culture of a spiral bacterium discovered in this habitat. Bacteria here convert phylloquinone to menaquinone and ferment inulin into short-chain fatty acids. (*)   H. pylori  was discovered in this habitat. Bacteria that live in this place, the most diverse part of the microbiota, are called flora, and form a signalling axis with the brain. Ruminants use bacteria that colonize this habitat to hydrolyze cellulose. For 10 points, name this habitat of commensal bacteria that are transplanted during fecal replacements.
Russell Schaedler names a group of eight common bacterial species that live in this habitat.
human  gut  [or human  intestines ; or  gastrointestinal  tract; or  GI  tract; or human  stomach ; or digestive  system; or  small intestines ; or  large intestines ; or  gut  microbiome; or  gut  flora; or  colon ; prompt on human  body or similar answers; prompt on  animal  bodies]