Facultative

• Facultative anaerobe
• Facultative biped
• Facultative carnivore
• Facultative heterochromatin
• Facultative lagoon
• Facultative parasite
• Facultative saprophyte
• Heterochromatin
• Obligate
• Opportunistic
• Transcription (genetics)
• anaerobic organism
• obligate
• omnivore
• parasite
• photoperiodic plant
• stabilization pond
• wastewater
• wetland indicator status