Question

which type of organisms can live both in presence or absence of oxygen

Answer 1

Hey mate i think amphibians can but they use oxygen only but in water , different way

Answer 2

Some obligate anaerobes use fermentation , while others use anaerobic respiration. Aetrotolearnt organism are strictly fermentative. In the presence of oxygen, facultative anaerobes respiration without oxygen, some of them fermentation some use anaerobic respiration