Words to Describe commensals

How commensals often is described ("________ commensals")

• upper
• vaginal
• genital
• simple
• obligatory
• invariable
• many
• bacterial
• innocuous
• anaerobic
• resident
• common
• normal
• intestinal
• ubiquitous
• fast
• saprophytic
• nasopharyngeal
• usual
• urethral
• constant
• oral
• frequent
• pathogenic
• nonpathogenic
• true
• gut
• oropharyngeal
• harmless
• obligate
• other
• human